Synonyms of let-down in English:

let-down


See definition of let-down

noun

1‘it's a big let-down when bonfire parties fizzle out’

SYNONYMS
disappointment, disillusionment, anticlimax, comedown, non-success, non-event, fiasco, setback, frustration, blow
informal washout, damp squib
ANTONYMS

triumph, climax