insensible, a. [unfeeling], [numb], insensate, [torpid], [unimpressible], [unsusceptible], [unconscious]; imperceptible, gradual, imperceivable.
inseparable, a. indivisible, indissoluble.
insert, v. interpolate, intercalate, interject, ingraft, inosculate.
insertion, n. interjection, interpolation, intercalation, inosculation.
inside, a. [internal], [inner], interior.
insides, n. pl. entrails; penetralia, recesses.
insight, n. [discernment].
insignificance, n. [unimportance], pettiness, immateriality, [triviality], inanity.
insignificant, n. meaningless; [unimportant], immaterial, [petty], [trivial], paltry.
insincere, a. disingenuous, dissembling, [false], [hypocritical], [affected], [deceitful].