/ Dictionary / Index U understrength: Meaning and Definition of Find definitions for: un•der•strength Pronunciation: (un"dur-strengkth', -strength', -strenth'), [key] — adj. having insufficient organizational strength; lacking in personnel: an understrength army. insufficient in power or efficacy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. understratum understructure Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language