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Definition of insensible : 1. Destitute of the power of feeling or perceiving; wanting bodily sensibility.
2. Incapable of being perceived by the senses; imperceptible. Hence: Progressing by imperceptible degrees; slow; gradual; as, insensible motion.
3. Not sensible or reasonable; meaningless.
4. Not susceptible of emotion or passion; void of feeling; apathetic; unconcerned; indifferent; as, insensible to danger, fear, love, etc.; - often used with of or to.

Synonyms:

swinish, sensual, base, unspiritual, vile, sottish, purposeless, witless, wooden, invisible, unaffected, wasted, brutish, bestial, unconcerned, anesthetic, attitude, reasonless, impalpable, knowledge, stolid, unobservable, indiscernible, unresponsive, imperceptible, insensate, superfluous, cold, pointless, nitwitted, coarse, asleep, intangible, unaware, brutal, detached, mindless, brute, beastly, awareness, lascivious, stuporous, bloodless, uninterested, undetectable, unintellectual, incurious, otiose, imbruted, carnal, animal, inappreciable, imponderable, soft-witted, feelings, indistinguishable, unnoticeable

inert (part of speech: adjective)

languid, sedentary, paralytic, lethargic, apathetic, passive, listless, languorous, inactive, immobile, stationary, stagnant, reposing, vegetative, dormant, inanimate, lifeless, inert, sluggish, still, static, idle, catatonic, motionless

indifferent (part of speech: adjective)

impervious, unappreciative, unmoved, indifferent, impassive

lethargic (part of speech: adjective)

dopey, slow, lackadaisical, tired, unhurried, benumbed, drooping, lumpish, slothful, torpid, leisurely, lazy, phlegmatic, drugged, indolent, leaden

senseless (part of speech: adjective)

insentient, unperceptive, soporific, numb, trance-like, dead, aloof, oblivious, dull, anesthetized, senseless, callous, faint, blacked out, swooning, unconscious, unfeeling, comatose, stupid, narcotic, insensitive

unaware (part of speech: adjective)

incognizant, preoccupied, inattentive, ignorant, uninformed, unobservant, unknowing

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