We found 22 dictionaries that define the word sad sack:

General (16 matching dictionaries)

1. sad-sack, sad sack: Merriam-Webster
2. sad sack: Oxford Learner's Dictionaries
3. sad sack: American Heritage Dictionary of the English Language
4. sad sack: Collins English Dictionary
5. sad sack: Vocabulary.com
6. sad-sack: Wordnik
7. sad-sack: Cambridge Advanced Learner's Dictionary
8. sad sack: Wiktionary
9. sad sack: The Wordsmyth English Dictionary-Thesaurus
10. sad sack: Infoplease Dictionary
11. sad-sack, sad sack: Dictionary.com
12. Sad Sack, Sad sack, The Sad Sack: Wikipedia, the Free Encyclopedia
13. sad sack: Rhymezone
14. sad sack: FreeDictionary.org
15. sad sack: Mnemonic Dictionary
16. sad sack: TheFreeDictionary.com

Computing (1 matching dictionary)

17. Sad Sack: Encyclopedia

Miscellaneous (2 matching dictionaries)

18. sad sack: A Word A Day
19. sad sack: Wordcraft Dictionary

Slang (3 matching dictionaries)

20. sad sack, sad sack: Green’s Dictionary of Slang
21. sad sack: English slang and colloquialisms used in the United Kingdom
22. sad sack: Urban Dictionary

(Note: See sad-sack as well.)

Definitions from Wiktionary (sad sack) ▸ noun:  An incompetent or inept person. ▸ noun:  A perennial failure or victim of misfortune. Similar: bungler, bumbler, blunderer, butcher, botcher, fumbler, sadsack, sackee, sacker, ball sack, more... Opposite: happy-go-lucky, optimistic, cheerful, upbeat, positive Adjectives: ass, shit, fugly, garbage, chickenshit, assy, shitten, sucky, batshit, poopy, jiveass ▸ Words similar to sad sack ▸ Usage examples for sad sack ▸ Idioms related to sad sack ▸ Wikipedia articles (New!) ▸ Words that often appear near sad sack ▸ Rhymes of sad sack ▸ Invented words related to sad sack