1.  Injury; hurt; damage; detriment; misfortune. [1913 Webster]

2.  That which causes injury, damage, or loss. [1913 Webster]
"We, ignorant of ourselves,
Beg often our own harms."

   To hurt; to injure; to damage; to wrong. [1913 Webster]
"Though yet he never harmed me." [1913 Webster]
"No ground of enmity between us known
Why he should mean me ill or seek to harm." [1913 Webster]

harm, n. & v.
--n. hurt, damage.
--v.tr. cause harm to.

Idiom:
out of harm's way in safety.

Etymology:
OE hearm, hearmian f. Gmc

N  evil, ill, harm, hurt, mischief, nuisance, machinations of the devil, Pandora's box, ills that flesh is heir to, blow, buffet, stroke, scratch, bruise, wound, gash, mutilation, mortal blow, wound, immedicabile vulnus, damage, loss, disadvantage, prejudice, drawback, disaster, accident, casualty, mishap, bad job, devil to pay, calamity, bale, catastrophe, tragedy, ruin, adversity, mental suffering, demon, (Evil spirit) bane, (cause of evil), badness, (Production of Evil), painfulness, evil doer, outrage, wrong, injury, foul play, bad turn, ill turn, disservice, spoliation, grievance, crying evil, disastrous, bad, awry, out of joint, disadvantageous, amis, wrong, ill, to one's cost, moving accidents by flood and field.

VB  be hurtful, cause evil, produce evil, inflict evil, work evil, do evil, damnify, endamage, hurt, harm, injure, pain, wrong, aggrieve, oppress, persecute, trample upon, tread upon, bear hard upon, put upon, overburden, weigh down, weigh heavy on, victimize, run down, molest, maltreat, abuse, ill-use, ill-treat, buffet, bruise, scratch, maul, smite, do violence, do harm, do a mischief, stab, pierce, outrage, do mischief, make mischief, bring into trouble, destroy.

VB  be worse, be deteriorated, become worse, become deteriorated Adj, have seen better days, deteriorate, degenerate, fall off, wane, ebb, retrograde, decline, droop, go down, go downhill, go from bad to worse, go farther and fare worse, jump out of the frying pan into the fire, run to seed, go to seed, run to waste swale, sweal, lapse, be the worse for, sphacelate: break, break down, spring a leak, crack, start, shrivel, fade, go off, wither, molder, rot, rankle, decay, go bad, go to decay, fall into decay, fall into the sear and yellow leaf, rust, crumble, shake, totter, totter to its fall, perish, die, deteriorate, weaken, put back, set back, taint, infect, contaminate, poison, empoison, envenom, canker, corrupt, exulcerate, pollute, vitiate, inquinate, debase, embase, denaturalize, denature, leaven, deflower, debauch, defile, deprave, degrade, ulcerate, stain, discolor, alloy, adulterate, sophisticate, tamper with, prejudice, pervert, prostitute, demoralize, brutalize, render vicious, embitter, acerbate, exacerbate, aggravate, injure, impair, labefy, damage, harm, hurt, shend, scath, scathe, spoil, mar, despoil, dilapidate, waste, overrun, ravage, pillage, wound, stab, pierce, maim, lame, surbate, cripple, hough, hamstring, hit between wind and water, scotch, mangle, mutilate, disfigure, blemish, deface, warp, blight, rot, corrode, erode, wear away, wear out, gnaw, gnaw at the root of, sap, mine, undermine, shake, sap the foundations of, break up, disorganize, dismantle, dismast, destroy, damnify, do one's worst, knock down, deal a blow to, play havoc with, play sad havoc with, play the mischief with, play the deuce with, play the very devil with, play havoc among, play sad havoc among, play the mischief among, play the deuce among, play the very devil among, decimate.

N  deterioration, debasement, wane, ebb, recession, retrogradation, decrease, degeneracy, degeneration, degenerateness, degradation, depravation, depravement, devolution, depravity, demoralization, retrogression, masochism, impairment, inquination, injury, damage, loss, detriment, delaceration, outrage, havoc, inroad, ravage, scath, perversion, prostitution, vitiation, discoloration, oxidation, pollution, defoedation, poisoning, venenation, leaven, contamination, canker, corruption, adulteration, alloy, decline, declension, declination, decadence, decadency, falling off, caducity, decrepitude, decay, dilapidation, ravages of time, wear and tear, corrosion, erosion, moldiness, rottenness, moth and rust, dry rot, blight, marasmus, atrophy, collapse, disorganization, delabrement (destruction), aphid, Aphis, plant louse, puceron, vinefretter, vinegrub, wreck, mere wreck, honeycomb, magni nominis umbra, jade, plug, rackabones, skate, tackey, tacky, have seen better days, deteriorate, degenerate, fall off, wane, ebb, retrograde, decline, droop, go down, go downhill, go from bad to worse, go farther and fare worse, jump out of the frying pan into the fire, run to seed, go to seed, run to waste swale, sweal, lapse, be the worse for, sphacelate: break, break down, spring a leak, crack, start, shrivel, fade, go off, wither, molder, rot, rankle, decay, go bad, go to decay, fall into decay, fall into the sear and yellow leaf, rust, crumble, shake, totter, totter to its fall, perish, die, deteriorate, weaken, put back, set back, taint, infect, contaminate, poison, empoison, envenom, canker, corrupt, exulcerate, pollute, vitiate, inquinate, debase, embase, denaturalize, denature, leaven, deflower, debauch, defile, deprave, degrade, ulcerate, stain, discolor, alloy, adulterate, sophisticate, tamper with, prejudice, pervert, prostitute, demoralize, brutalize, render vicious, embitter, acerbate, exacerbate, aggravate, injure, impair, labefy, damage, harm, hurt, shend, scath, scathe, spoil, mar, despoil, dilapidate, waste, overrun, ravage, pillage, wound, stab, pierce, maim, lame, surbate, cripple, hough, hamstring, hit between wind and water, scotch, mangle, mutilate, disfigure, blemish, deface, warp, blight, rot, corrode, erode, wear away, wear out, gnaw, gnaw at the root of, sap, mine, undermine, shake, sap the foundations of, break up, disorganize, dismantle, dismast, destroy, damnify, do one's worst, knock down, deal a blow to, play havoc with, play sad havoc with, play the mischief with, play the deuce with, play the very devil with, play havoc among, play sad havoc among, play the mischief among, play the deuce among, play the very devil among, decimate, Adj, unimproved &c (improve), deteriorated, altered, altered for the worse, injured, sprung, withering, spoiling, on the wane, on the decline, tabid, degenerate, marescent, worse, the worse for, all the worse for, out of repair, out of tune, imperfect, the worse for wear, battered, weathered, weather-beaten, stale, passe, shaken, dilapidated, frayed, faded, wilted, shabby, secondhand, threadbare, worn, worn to a thread, worn to a shadow, worn to the stump, worn to rags, reduced, reduced to a skeleton, far gone, tacky, decayed, moth-eaten, worm-eaten, mildewed, rusty, moldy, spotted, seedy, time-worn, moss-grown, discolored, effete, wasted, crumbling, moldering, rotten, cankered, blighted, tainted, depraved, decrepid, decrepit, broke, busted, broken, out of commission, hors de combat, out of action, broken down, done, done for, done up, worn out, used up, finished, beyond saving, fit for the dust hole, fit for the wastepaper basket, past work, at a low ebb, in a bad way, on one's last legs, undermined, deciduous, nodding to its fall, tottering, past cure, fatigued, retrograde, deleterious, out of the frying pan into the fire, agrescit medendo, what a falling off was there!.

N  pleasurableness, pleasantness, agreeableness, pleasure giving, jucundity, delectability, amusement, attraction, attractiveness, attractability, invitingness, harm, fascination, enchantment, witchery, seduction, winning ways, amenity, amiability, winsomeness, loveliness, sunny side, bright side, sweets, goodness, manna in the wilderness, land flowing with milk and honey, bittersweet, fair weather, treat, regale, dainty, titbit, tidbit, nuts, sauce piquante, causing pleasure, laetificant, pleasure-giving, pleasing, pleasant, pleasurable, agreeable, grateful, gratifying, leef, lief, acceptable, welcome, welcome as the roses in May, welcomed, favorite, to one's taste, to one's mind, to one's liking, satisfactory, refreshing, comfortable, cordial, genial, glad, gladsome, sweet, delectable, nice, dainty, delicate, delicious, dulcet, luscious, palatable, luxurious, voluptuous, sensual, attractive, inviting, prepossessing, engaging, winning, winsome, taking, fascinating, captivating, killing, seducing, seductive, heart-robbing, alluring, enticing, appetizing, cheering, bewitching, enchanting, entrancing, enravishing, charming, delightful, felicitous, exquisite, lovely, ravishing, rapturous, heartfelt, thrilling, ecstatic, beatic, beatific, seraphic, empyrean, elysian, palmy, halcyon, Saturnian, decies repetita placebit, charms strike the sight but merit wins the soul, sweetness and light, beauty is only skin deep.

VB  be malevolent, bear spleen, harbor spleen, bear a grudge, harbor a grudge, bear malice, betray the cloven foot, show the cloven foot, hurt, annoy, injure, harm, wrong, do harm to, do an ill office to, outrage, disoblige, malign, plant a thorn in the breast, molest, worry, harass, haunt, harry, bait, tease, throw stones at, play the devil with, hunt down, dragoon, hound, persecute, oppress, grind, maltreat, illtreat, ill-use, wreak one's malice on, do one's worst, break a butterfly on the wheel, dip one's hands in blood, imbrue one's hands in blood, have no mercy.

grievous bodily harm