1.  cad(n = noun.person) blackguard, bounder, dog, heel, hound - someone who is morally reprehensible; "you dirty dog"
is a kind of scoundrel, villain
has particulars: perisher

2.  cad(n = noun.communication) computer-aided design - software used in art and architecture and engineering and manufacturing to assist in precision drawing;
is a kind of computer software, package, software, software package, software program, software system

1.  A person who stands at the door of an omnibus to open and shut it, and to receive fares; an idle hanger-on about innyards. Dickens. [1913 Webster]

2.  A lowbred, presuming person; a mean, vulgar fellow. Thackeray. [1913 Webster]

cad, abbr. computer-aided design.

cad, n. a person (esp. a man) who behaves dishonourably.

Derivative:
caddish adj. caddishly adv. caddishness n.

Etymology:
abbr. of CADDIE in sense 'odd-job man'

N  servant, subject, liegeman, servant, retainer, follower, henchman, servitor, domestic, menial, help, lady help, employe, attache, official, retinue, suite, cortege, staff, court, attendant, squire, usher, page, donzel, footboy, train bearer, cup bearer, waiter, lapster, butler, livery servant, lackey, footman, flunky, flunkey, valet, valet de chambre, equerry, groom, jockey, hostler, ostler, tiger, orderly, messenger, cad, gillie, herdsman, swineherd, barkeeper, bartender, bell boy, boots, boy, counterjumper, khansamah, khansaman, khitmutgar, yardman, bailiff, castellan, seneschal, chamberlain, major-domo, groom of the chambers, secretary, under secretary, assistant secretary, clerk, subsidiary, agent, subaltern, underling, understrapper, man, maid, maidservant, handmaid, confidente, lady's maid, abigail, soubrette, amah, biddy, nurse, bonne, ayah, nursemaid, nursery maid, house maid, parlor maid, waiting maid, chamber maid, kitchen maid, scullery maid, femme de chambre, femme fille, camarista, chef de cuisine, cordon bleu, cook, scullion, Cinderella, potwalloper, maid of all work, servant of all work, laundress, bedmaker, journeyman, charwoman, bearer, chokra, gyp (Cambridge), hamal, scout (Oxford), serf, vassal, slave, negro, helot, bondsman, bondswoman, bondslave, ame damnee, odalisque, ryot, adscriptus gleboe, villian, villein, beadsman, bedesman, sizar, pensioner, pensionary, client, dependant, dependent, hanger on, satellite, parasite, led captain, protege, ward, hireling, mercenary, puppet, tool, creature, badge of slavery, bonds, in the train of, in one's pay, in one's employ, at one's call, in bonds.

N  vulgarity, vulgarism, barbarism, Vandalism, Gothicism, mauvis gout, bad taste, gaucherie, awkwardness, want of tact, ill-breeding, courseness, indecorum, misbehavior, lowness, homeliness, low life, mauvais ton, rusticity, boorishness, brutality, rowdyism, blackguardism, ribaldry, slang, bad joke, mauvais plaisanterie, gaudiness, tawdriness, false ornament, finery, frippery, trickery, tinsel, gewgaw, clinquant, baroque, rococo, rough diamond, tomboy, hoyden, cub, unlicked cub, clown, Goth, Vandal, Boeotian, snob, cad, gent, parvenu, frump, dowdy, slattern, in bad taste vulgar, unrefined, coarse, indecorous, ribald, gross, unseemly, unbeseeming, unpresentable, contra bonos mores, ungraceful, dowdy, slovenly, ungenteel, shabby genteel, low, common, hoi polloi, uncourtly, uncivil, ill bred, ill mannered, underbred, ungentlemanly, ungentlemanlike, unladylike, unfeminine, wild, wild as an unbacked colt, untutored, unschooled (ignorant), unkempt, uncombed, untamed, unlicked, unpolished, uncouth, plebeian, incondite, heavy, rude, awkward, homely, homespun, home bred, provincial, countrified, rustic, boorish, clownish, savage, brutish, blackguard, rowdy, snobbish, barbarous, barbaric, Gothic, unclassical, doggerel, heathenish, tramontane, outlandish, uncultivated, Bohemian, obsolete, unfashionable, newfangled, odd, particular, affected, meretricious, extravagant, monstrous, horrid, shocking, gaudy, tawdry, overornamented, baroque, rococo, bedizened, tricked out, gingerbread, obtrusive.

N  commonality, commonalty, democracy, obscurity, low condition, low life, low society, low company, bourgeoisie, mass of the people, mass of society, Brown Jones and Robinson, lower classes, humbler classes, humbler orders, vulgar herd, common herd, rank and file, hoc genus omne, the many, the general, the crowd, the people, the populace, the multitude, the million, the masses, the mobility, the peasantry, king Mob, proletariat, fruges consumere nati, demos, hoi polloi, great unwashed, man in the street, mob, rabble, rabble rout, chaff, rout, horde, canaille, scum of the people, residuum of the people, dregs of the people, dregs of society, swinish multitude, foex populi, trash, profanum vulgus, ignobile vulgus, vermin, riffraff, ragtag and bobtail, small fry, commoner, one of the people, democrat, plebeian, republican, proletary, proletaire, roturier, Mr, Snooks, bourgeois, epicier, Philistine, cockney, grisette, demimonde, peasant, countryman, boor, carle, churl, villain, villein, terrae filius, son of the land, serf, kern, tyke, tike, chuff, ryot, fellah, longshoreman, swain, clown, hind, clod, clodhopper, hobnail, yokel, bog-trotter, bumpkin, plowman, plowboy, rustic, hayseed, lunkhead, chaw-bacon, tiller of the soil, hewers of wood and drawers of water, groundling, gaffer, loon, put, cub, Tony Lumpkin, looby, rube, lout, underling, gamin, rough, pot- wallopper, slubberdegullion, vulgar fellow, low fellow, cad, curmudgeon, upstart, parvenu, skipjack, nobody, nobody one knows, hesterni quirites, pessoribus orti, bourgeois gentilhomme, novus homo, snob, gent, mushroom, no one knows who, adventurer, man of straw, beggar, gaberlunzie, muckworm, mudlark, sans culotte, raff, tatterdemalion, caitiff, ragamuffin, Pariah, outcast of society, tramp, vagabond, bezonian, panhandler, sundowner, chiffonnier, Cinderella, cinderwench, scrub, jade, gossoon, Goth, Vandal, Hottentot, Zulu, savage, barbarian, Yahoo, unlicked cub, rough diamond, barbarousness, barbarism, boeotia, ignoble, common, mean, low, base, vile, sorry, scrubby, beggarly, below par, no great shakes, homely, homespun, vulgar, low-minded, snobbish, plebeian, proletarian, of low parentage, of low origin, of low extraction, of mean parentage, of mean origin, of mean extraction, lowborn, baseborn, earthborn, mushroom, dunghill, risen from the ranks, unknown to fame, obscure, untitled, rustic, uncivilized, loutish, boorish, clownish, churlish, brutish, raffish, rude, unlicked, barbarous, barbarian, barbaric, barbaresque, cockney, born within sound of Bow bells, underling, menial, subaltern, below the salt, dummodo sit dives barbarus ipse placet.