underachiever (noun) failure: person who does not succeed
Sinonime: also-ran, bankrupt,
beat*, born loser,
bum, castaway, deadbeat, defaulter,
derelict,
disappointment, dud, flop, good-for-nothing, has-been,
incompetent, insolvent, loafer,
loser, lumpy, might-have-been, moocher, no-good, nobody, nonperformer,
prodigal, turkey, underachiever, washout
Antonime: achiever,
success