| terrible(adjective, mean, bad, poor, base) |
| trashy(adjective, mean, bad, poor, base) |
| trumpery(adjective, mean, bad, poor, base) |
| two-bit(adjective, mean, bad, poor, base) |
| unable(adjective, skill, incompetent, talent, unqualified) |
| unapt(adjective, incompetent, unqualified, inept, unable) |
| unavailable(adjective, weak, stupid, idle, useless) |
| unavailing(adjective, weak, poor, stupid, inferior) |
| underachiever(noun, beat, failure, disappointment, incompetent) |
| unfit(adjective, weak, skill, ready, inadequate) |
| unfitted(adjective, weak, skill, inadequate, unfit) |
| unfunctional(adjective, weak, stupid, idle, incompetent) |
| unhandy(adjective, incompetent, unqualified, inept, unable) |
| unpleasant(adjective, bad, nasty, corrupt, vile) |
| unpracticed(adjective, incompetent, unqualified, inept, unable) |
| unprepared(adjective, incompetent, unqualified, inept, unable) |
| unprincipled(adjective, vile, shady, dishonorable, lowly) |
| unproductive(adjective, weak, poor, stupid, inferior) |
| unproficient(adjective, incompetent, unqualified, inept, unable) |
| unprofitable(adjective, weak, poor, stupid, inferior) |