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HYPHEN
COUNT IN NET
WORDNET DICTIONARY
CIDE DICTIONARY
THESAURUS
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WORDNET DICTIONARY

Adjective unconcerned has 3 senses

• unconcerned(a = adj.all) Array - lacking in interest or care or feeling; "the average American...is unconcerned that his or her plight is the result of a complex of personal and economic and governmental actions...beyond the normal citizen's comprehension and control"; "blithely unconcerned about his friend's plight"
Antonym: concerned

• unconcerned(s = adj.all) Array - easy in mind; not worried; "the prisoner seems entirely unconcerned as to the outcome of the examination"
• unconcerned(s = adj.all) Array - not occupied or engaged with; "readers unconcerned with style"

CIDE DICTIONARY

THESAURUS

unconcerned

Laodicean, Olympian, aloof, apathetic, ataractic, benumbed, blah, blase, bored, careless, casual, collected, comatose, composed, cool, degage, desensitized, detached, devil-may-care, disinterested, dispassionate, disregardful, distant, dull, easy, easygoing, free and easy, heartless, hebetudinous, heedless, hopeless, impassive, in a stupor, inattentive, incurious, indifferent, inexcitable, insouciant, lackadaisical, languid, lethargic, listless, mindless, negligent, nonchalant, numb, numbed, offhand, passive, perfunctory, phlegmatic, pluckless, pococurante, reckless, regardless, remote, resigned, slack, sluggish, soporific, spiritless, spunkless, stoic, stolid, stupefied, supine, torpid, turned-off, unanxious, uncaring, undiscriminating, uninquiring, uninterested, uninvolved, unmindful, unsolicitous, withdrawn

ROGET THESAURUS

unconcerned

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.

For further exploring for "unconcerned" in Webster Dictionary Online