unsuccessful
un-suc-cess-ful
adjective
Not achieving the desired aim or result; failing to succeed in something.
"Their attempt to climb the mountain was unsuccessful."
Thesaurus
Synonyms: washed-up, discomfited, defeated, no-win, attempted, thwarted, down-and-out, empty-handed, undone, self-defeating, out, pointless
Antonyms: successful