quitter[noun]Synonyms: coward, chicken, craven, dastard, funk, funker, poltroon, yellowbelly
[TahlilGaran] English Synonym Dictionary ▲
quit‧ter /ˈkwɪtə $ -ər/
noun [countable] informal someone who does not have the determination or courage to finish something that is difficult
[TahlilGaran] Dictionary of Contemporary English ▲