We found 26 dictionaries that define the word letdown:

General (21 matching dictionaries)

1. letdown: Longman Dictionary of Contemporary English
2. letdown: Merriam-Webster
3. letdown: Oxford Learner's Dictionaries
4. letdown: American Heritage Dictionary of the English Language
5. letdown: Collins English Dictionary
6. letdown: Vocabulary.com
7. Letdown, letdown: Wordnik
8. letdown: Cambridge Advanced Learner's Dictionary
9. letdown: Wiktionary
10. letdown: Webster's New World College Dictionary, 4th Ed.
11. letdown: The Wordsmyth English Dictionary-Thesaurus
12. letdown: Infoplease Dictionary
13. letdown: Dictionary.com
14. letdown: Cambridge Essential American English Dictionary
15. The Letdown: Wikipedia, the Free Encyclopedia
16. letdown: Rhymezone
17. letdown: FreeDictionary.org
18. letdown: Mnemonic Dictionary
19. letdown: TheFreeDictionary.com

Business (1 matching dictionary)

20. letdown: Legal dictionary

Computing (1 matching dictionary)

21. letdown: Encyclopedia

Medicine (2 matching dictionaries)

22. letdown: Merriam-Webster Medical Dictionary
23. letdown: Medical dictionary

Slang (1 matching dictionary)

24. letdown: Urban Dictionary

(Note: See letdowns as well.)

Definitions from Wiktionary ( ) ▸ noun:  Alternative form of let-down [(countable) A disappointment or anticlimax.] Similar: disappointment, disappointing, bummer, underwhelming, lackluster, shocker, anticlimactic, hiccup, setback, anticlimax, more... Opposite: uplift, satisfaction, fulfillment, success Types: disappointment, betrayal, anticlimax, disillusionment, frustration, setback, failure, defeat, more... Phrases: milk letdown, milk letdown failure, The Beautiful Letdown, The Letdown, total letdown, more... Adjectives: big, emotional, real, terrible, inevitable, great, such, general, tremendous, psychological, natural ▸ Words similar to letdown ▸ Usage examples for letdown ▸ Idioms related to letdown ▸ Wikipedia articles (New!) ▸ Popular adjectives describing letdown ▸ Words that often appear near letdown ▸ Rhymes of letdown ▸ Invented words related to letdown