Not perceptible by the senses; imperceptible; inappreciable.Not sensible to the mind; not consciously apprehended or appreciated; unconscious.Without the power of feeling or sensation; without corporeal sensibility.Not susceptible of emotion or passion; void of feeling or tenderness: as, to be insensible to the sufferings of others.Void of sense or meaning; meaningless.Dull, torpid, senseless, unconscious, unfeeling, unsusceptible, indifferent, hard, callous.n. One who is lacking in sensibility; a thoroughly apathetic person.