Word Study
insouciance
CIDE DICTIONARY
insouciance, n. [F.].
Carelessness; heedlessness; thoughtlessness; unconcern. [1913 Webster]
THESAURUS
insouciance
abandon, accidia, acedia, aloofness, apathy, ataraxia, ataraxy, benumbedness, blah, blahs, boredom, careless abandon, carelessness, casualness, comatoseness, cursoriness, detachment, disinterest, disinterestedness, dispassion, disregard, disregardfulness, dullness, easiness, easygoingness, forgetfulness, hastiness, heartlessness, hebetude, heedlessness, hopelessness, impassiveness, impassivity, inappetence, inattention, inconsiderateness, inconsideration, incuriosity, incuriousness, indifference, indifferentism, indifferentness, indiscrimination, inexcitability, intellectual inertia, lack of affect, lack of appetite, lack of foresight, lack of interest, lackadaisicalness, languidness, lassitude, laziness, lethargicalness, lethargy, listlessness, mindlessness, negligence, nonchalance, numbness, oblivion, offhandedness, passiveness, passivity, perfunctoriness, phlegm, phlegmaticalness, phlegmaticness, plucklessness, pococurantism, recklessness, regardlessness, resignation, resignedness, sloth, sluggishness, sopor, soporifousness, spiritlessness, sprezzatura, spunklessness, stolidity, stupefaction, stupor, supineness, tactlessness, thoughtlessness, torpidity, torpidness, torpor, unanxiousness, unconcern, unheedfulness, uninquisitiveness, uninterestedness, unmindfulness, unpreparedness, unreadiness, unsolicitousness, unsolicitude, unthinkingness, withdrawal, withdrawnnessROGET THESAURUS
insouciance
Insensibility
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.Indifference
N indifference, neutrality, coldness, anaphrodisia, unconcern, insouciance, nonchalance, want of interest, want of earnestness, anorexy, anorexia, inappetency, apathy, supineness, disdain, recklessness, inattention, anaphrodisiac, antaphrodisiac, lust-quencher, passion-queller, indifferent, cold, frigid, lukewarm, cool, cool as a cucumber, unconcerned, insouciant, phlegmatic, pococurante, easygoing, devil-may- care, careless, listless, lackadaisical, half-hearted, unambitious, unaspiring, undesirous, unsolicitous, unattracted, aloof, unapproachable, remote, uncaring, unattractive, unalluring, undesired, undesirable, uncared for, unwished, unvalued, all one to, insipid, vain, for aught one cares, Int, never mind, Who cares? whatever you like, whatever, I couldn't care less, I could care less, anything will do, es macht nichts.Incuriosity
N incuriosity, incuriousness, insouciance, indifference, lack of interest, disinterest, boredom, ennui (weariness), satiety, foreknowledge (foresight), incurious, uninquisitive, indifferent, impassive, uninterested, detached, aloof.Inattention
N inattention, inconsideration, inconsiderateness, oversight, inadvertence, inadvertency, nonobservance, disregard, supineness, etourderie, want of thought, heedlessness, insouciance, abstraction, absence of mind, absorption of mind, preoccupation, distraction, reverie, brown study, deep musing, fit of abstraction, inattentive, unobservant, unmindful, heedless, unthinking, unheeding, undiscerning, inadvertent, mindless, regardless, respectless, listless, blind, deaf, bird-witted, hand over head, cursory, percursory, giddy-brained, scatter-brained, hare-brained, unreflective, unreflecting, ecervele, offhand, dizzy, muzzy, brainsick, giddy, giddy as a goose, wild, harum-scarum, rantipole, highflying, heedless, careless, inconsiderate, thoughtless, absent, abstracted, distrait, absentminded, lost, lost in thought, wrapped in thought, rapt, in the clouds, bemused, dreaming on other things, musing on other things, preoccupied, engrossed, daydreaming, in a reverie, off one's guard, napping, dreamy, caught napping, disconcerted, distracted, put out, inattentively, inadvertently, absent-mindedly, per incuriam, sub silentio, Int, stand at ease, stand easy!, the attention wanders, one's wits gone a woolgathering, one's wits gone a bird's nesting, it never entered into one's head, the mind running on other things, one's thoughts being elsewhere, had it been a bear it would have bitten you.For further exploring for "insouciance" in Webster Dictionary Online