/ Dictionary / Index I inactive: Meaning and Definition of Find definitions for: in•ac•tive Pronunciation: (in-ak'tiv), [key] — adj. not active: an inactive volcano. sedentary or passive: an inactive life. sluggish; indolent. not on active duty. inert; unreactive. noting a compound that has no effect on polarized light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: inactive (Thesaurus) inactivate inadequacy Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language