1.  coolness(n = noun.feeling) imperturbability, imperturbableness - calm and unruffled self-assurance; "he performed with all the coolness of a veteran"
is a kind of calmness
Derived form adjective cool₆

2.  coolness(n = noun.attribute) chilliness, nip - the property of being moderately cold; "the chilliness of early morning"
is a kind of cold, coldness, frigidity, frigidness, low temperature
Derived form adjective cool₁

3.  coolness(n = noun.attribute) nervelessness - fearless self-possession in the face of danger;
is a kind of fearlessness
Derived form adjective cool₂

4.  coolness(n = noun.attribute) chilliness, coldness, frigidity, frigidness, iciness - a lack of affection or enthusiasm; "a distressing coldness of tone and manner"
is a kind of emotionlessness, unemotionality
has particulars: stone, lukewarmness, tepidness
Derived form adjective cool₄

1.  The state of being cool; a moderate degree of cold; a moderate degree, or a want, of passion; want of ardor, zeal, or affection; calmness. [1913 Webster]

2.  Calm impudence; self-possession. [1913 Webster]

N  insensibility, insensibleness, moral insensibility, inertness, inertia, vis inertiae, impassibility, impassibleness, inappetency, apathy, phlegm, dullness, hebetude, supineness, lukewarmness, cold fit, cold blood, cold heart, coldness, coolness, frigidity, sang froid, stoicism, imperturbation, nonchalance, unconcern, dry eyes, insouciance, recklessness, callousness, heart of stone, stock and stone, marble, deadness, torpor, torpidity, obstupefaction, lethargy, coma, trance, vegetative state, sleep, suspended animation, stupor, stupefaction, paralysis, palsy, numbness, neutrality, quietism, vegetation, insensible, unconscious, impassive, impassible, blind to, deaf to, dead to, unsusceptible, insusceptible, unimpressionable, unimpressible, passionless, spiritless, heartless, soulless, unfeeling, unmoral, apathetic, leuco-, phlegmatic, dull, frigid, cold blooded, cold hearted, cold as charity, flat, maudlin, obtuse, inert, supine, sluggish, torpid, torpedinous, torporific, sleepy, languid, half-hearted, tame, numbed, comatose, anaesthetic, stupefied, chloroformed, drugged, stoned, palsy-stricken, indifferent, lukewarm, careless, mindless, regardless, inattentive, neglectful, disregarding, unconcerned, nonchalant, pococurante, insouciant, sans souci, unambitious, unaffected, unruffled, unimpressed, uninspired, unexcited, unmoved, unstirred, untouched, unshocked, unstruck, unblushing, unanimated, vegetative, callous, thick-skinned, hard-nosed, pachydermatous, impervious, hardened, inured, casehardened, steeled against, proof against, imperturbable, unfelt, insensibly, aequo animo, without being moved, without being touched, without being impressed, in cold blood, with dry eyes, with withers unwrung, never mind, macht nichts, it is of no consequence, it cannot be helped, nothing coming amiss, it is all the same to, it is all one to.

N  inexcitability, imperturbability, inirritability, even temper, tranquil mind, dispassion, tolerance, patience, coolth, passiveness, hebetude, hebetation, impassibility, stupefaction, coolness, calmness, composure, placidity, indisturbance, imperturbation, sang froid, tranquility, serenity, quiet, quietude, peace of mind, mental calmness, staidness, gravity, sobriety, Quakerism, philosophy, equanimity, stoicism, command of temper, self-possession, self-control, self-command, self-restraint, ice water in one's veins, presence of mind, submission, resignation, sufferance, supportance, endurance, longsufferance, forbearance, longanimity, fortitude, patience of Job, patience on a monument, patience 'sovereign o'er transmuted ill', moderation, repression of feelings, subjugation of feeling, restraint, tranquillization, inexcitable, unexcitable, imperturbable, unsusceptible, unpassionate, dispassionate, cold-blooded, irritable, enduring, stoical, Platonic, philosophic, staid, stayed, sober, sober minded, grave, sober as a judge, grave as a judge, sedate, demure, cool-headed, easy-going, peaceful, placid, calm, quiet as a mouse, tranquil, serene, cool as a cucumber, cool as a custard, undemonstrative, temperate, composed, collected, unexcited, unstirred, unruffled, undisturbed, unperturbed, unimpassioned, unoffended, unresisting, meek, tolerant, patient, patient as Job, submissive, tame, content, resigned, chastened, subdued, lamblike, gentle as a lamb, suaviter in modo, mild as mothers milk, soft as peppermint, armed with patience, bearing with, clement, long-suffering, like patience on a monument smiling at grief, aequo animo, in cold blood, more in sorrow than in anger, Int, patience!, and shuffle the cards, cool calm and collected, keep calm in the midst of a storm, adversity's sweet milk, philosophy, mens aequa in arduis philosophia stemma non inspec, quo me cumque rapit tempestas deferor hospes, they also serve who only stand and wait.

N  caution, cautiousness, discretion, prudence, cautel, heed, circumspection, calculation, deliberation, foresight, vigilance, warning, coolness, self-possession, self-command, presence of mind, sang froid, well-regulated mind, worldly wisdom, Fabian policy, cautious, wary, guarded, on one's guard, cavendo tutus, in medio tutissimus, vigilant, careful, heedful, cautelous, stealthy, chary, shy of, circumspect, prudent, discreet, politic, sure-footed, unenterprising, unadventurous, cool, steady, self-possessed, overcautious, cautiously, Int, have a care!, timeo Danaos, festina lente, ante victoriam ne canas triumphum, don't sing out victory before the triumph, give, every man thine ear but few thy voice, he who laughs last laughs best, il rit bien qui rit le dernier, ni firmes carta que no leas ni bebas agua que no v, nescit vox missa reverti, love all, trust a few, noli irritare leones, safe bind safe find, if it ain't broke, don't fix it.

N  hate, hatred, vials of hate, disaffection, disfavor, alienation, estrangement, coolness, enmity, animosity, umbrage, pique, grudge, dudgeon, spleen bitterness, bitterness of feeling, ill blood, bad blood, acrimony, malice, implacability, repugnance, misanthropy, demonophobia, gynephobia, negrophobia, odium, unpopularity, detestation, antipathy, object of hatred, object of execration, abomination, aversion, b=ete noire, enemy, bitter pill, source of annoyance, hating, abhorrent, averse from, set against, bitter, implacable, unloved, unbeloved, unlamented, undeplored, unmourned, uncared for, unendeared, un-valued, disliked, crossed in love, forsaken, rejected, lovelorn, jilted, obnoxious, hateful, odious, abominable, repulsive, offensive, shocking, disgusting, reprehensible, invidious, spiteful, malicious, insulting, irritating, provoking, at daggers drawn, not on speaking terms, at loggerheads, no love lost between.