quitter

quit·ter  (kwtr)

n.

One who gives up easily.

Thesaurus

Noun

1.

quitter - a person who gives up too easily individual, mortal, person, somebody, someone, soul - a human being; "there was too much for one person to do" abdicator - one who formally relinquishes an office or responsibility dropout - someone who quits school before graduation apostate, deserter, ratter, turncoat, recreant, renegade - a disloyal person who betrays or deserts his cause or religion or political party or friend etc.