/ Dictionary / Index U unaccounted-for: Meaning and Definition of Find definitions for: un•ac•count•ed-for Pronunciation: (un"u-koun'tid-fôr"), [key] — adj. not accounted for; not understood; unexplained: an explosion resulting from some unaccounted-for mechanical failure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unaccountable unaccustomed 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