/ Dictionary / Index S sad sack: Meaning and Definition of Find definitions for: sad' sack" Pronunciation: [key] — Slang. Slang. a pathetically inept person, esp. a soldier, who continually blunders in spite of good intentions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sadowa sad tree Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language