Synonyms of underachievers

1 Syllable

flop, bum, beat, dud

2 Syllables

bankrupt, moocher, loser, turkey, washout, lumpy, has-been, loafer, no-good, deadbeat

3 Syllables

castaway, defaulter, derelict, might-have-been, also-ran, prodigal, insolvent, nobody

4 Syllables

good-for-nothing, nonperformer, incompetent, disappointment