Marked by blithe unconcern:
— An utterly insouciant financial policy.
— An elegantly insouciant manner.

synonyms: casual, nonchalant.

Roget 866: 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.    [indifferent toward people] aloof, unapproachable, remote; uncaring.    unattractive, unalluring, undesired, undesirable, uncared for, unwished^†, unvalued, all one to.    insipid etc. 391; vain.    ... show more

Roget 460: neglecting etc. v.; unmindful, negligent, neglectful; heedless, careless, thoughtless; perfunctory, remiss; feebleness etc. 575.    inconsiderate; uncircumspect^†, incircumspect^†; off one's guard; unwary, unwatchful^†, unguarded; offhand.    supine etc. (inactive) 683; inattentive etc. 458; insouciant etc. (indifferent) 823; imprudent, reckless etc. 863; slovenly etc. (disorderly) 59, (dirty) 653; inexact etc. (erroneous) 495; improvident etc. 674.    neglected etc. v.; unheeded, uncared-for, unperceived, unseen, unobserved, unnoticed, unnoted^†, unmarked, unattended to, unthought of, unregarded^†, unremarked, unmissed^†; shunted, shelved.    unexamined, unstudied, unsearched^†, unscanned^†, unweighed^†, unsifted, unexplored.    abandoned; buried in a napkin, hid under a bushel.    ... show more

Roget 823: 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 etc. (inactive) 683; languid, half-hearted, tame; numbed; comatose; anaesthetic etc. 376; stupefied, chloroformed, drugged, stoned; palsy-stricken.    indifferent, lukewarm; careless, mindless, regardless; inattentive etc. 458; neglectful etc. 460; disregarding.    unconcerned, nonchalant, pococurante^†, insouciant, sans souci [Fr.]; unambitious etc. 866.    unaffected, unruffled, unimpressed, uninspired, unexcited, unmoved, unstirred, untouched, unshocked^†, unstruck^†; unblushing etc. (shameless) 885; unanimated; vegetative.    callous, thick-skinned, hard-nosed, pachydermatous, impervious; hardened; inured, casehardened; steeled against, proof against; imperturbable etc. (inexcitable) 826^†; unfelt.    ... show more