Synonyms of unsuccessful in English:

unsuccessful


See definition of unsuccessful

adjective

1‘an unsuccessful attempt’

SYNONYMS
failed, without success, abortive, misfired
vain, in vain, futile, useless, pointless, worthless, nugatory
ineffective, ineffectual, inefficacious, unavailing, fruitless, profitless, unproductive
thwarted, balked, frustrated, foiled
archaic bootless
ANTONYMS

successful

2‘an unsuccessful business venture’

SYNONYMS
unprofitable, unprosperous, loss-making
failed, losing, beaten
unlucky, luckless, out of luck, unfortunate, ill-starred, fated, ill-fated, ill-omened
ANTONYMS

profitable, winning