101 fail synonyms include break down, break, stop working, cease to function, cut out, stop, stall, crash, give out, and malfunction. Fail is a verb, and its antonyms are succeed and thrive. Here are some additional synonyms for "fail" with example sentences.
101 other ways to say fail.
He completes his morning run without fail.
She calls her parents every weekend without fail.
They submit their assignments on time without fail.
without fail.