/ Dictionary / Index U unsuitable: Meaning and Definition of Find definitions for: un•suit•a•ble Pronunciation: (un-s'tu-bul), [key] — adj. not suitable; inappropriate; unfitting; unbecoming. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unsuitable (Thesaurus) unsuccessful unsung Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language