unsuccessful

adjectives

not successful; having failed or having an unfavorable outcome

unsuccessful

antonym

successful

is similar to

tried unsuccessfully

"attempted murder"

attempted

is similar to

disappointingly unsuccessful

"disappointed expectations and thwarted ambitions"; "their foiled attempt to capture Calais"; "many frustrated poets end as pipe-smoking teachers"; "his best efforts were thwarted"

defeated, disappointed, discomfited, foiled, frustrated, thwarted

is similar to

doomed to extinction

done for, ruined, sunk, undone, washed-up

is similar to

lacking resources (or any prospect of resources)

down-and-out

is similar to

having acquired or gained nothing

"the returned from the negotiations empty-handed"

empty-handed, unrewarded

is similar to

(of a batter) without a hit

"he went hitless for three innings"

hitless

is similar to

certain to end in failure and disappointment

"a no-win situation"

no-win

is similar to

out of power; especially having been unsuccessful in an election

"now the Democrats are out"

out

is similar to

having no points scores

"a scoreless inning"

goalless, hitless, scoreless

is similar to

acting to defeat its own purpose

"it is self-defeating...to ignore the progress of events"

self-defeating

is similar to

of persons; marked by failure to realize full potentialities

"unfulfilled and uneasy men"; "unrealized dreams and ambitions"

unfulfilled, unrealised, unrealized

is similar to

not one of the first three in a race or competition

unplaced

is similar to

having no wins

"the team had a very disappointing winless season"

winless