| two-faced(adjective, dishonest, immoral, rotten, untrustworthy) |
| unalert(adjective, careless, bold, thoughtless, impulsive) |
| unarmed(adjective, vulnerable, insecure, helpless, powerless) |
| unblocked(adjective, unfastened, gaping, ajar, unclosed) |
| unbounded(adjective, complete, absolute, unrestrained, endless) |
| uncluttered(adjective, unfastened, gaping, ajar, unclosed) |
| unconditional(adjective, complete, absolute, unrestrained, extensive) |
| unconfined(adjective, complete, unrestrained, endless, indefinite) |
| unconstrained(adjective, complete, absolute, unrestrained, extensive) |
| underhanded(adjective, dishonest, immoral, rotten, untrustworthy) |
| unending(adjective, endless, immense, infinite, unlimited) |
| unethical(adjective, dishonest, immoral, rotten, untrustworthy) |
| unfaithful(adjective, dishonest, immoral, rotten, untrustworthy) |
| unfathomed(adjective, complete, absolute, unrestrained, extensive) |
| unfettered(adjective, complete, absolute, unrestrained, extensive) |
| unlimited(adjective, complete, unrestrained, extensive, endless) |
| unmindful(adjective, careless, bold, thoughtless, impulsive) |
| unobstructed(adjective, unfastened, gaping, ajar, unclosed) |
| unprincipled(adjective, dishonest, immoral, rotten, untrustworthy) |
| unprotected(adjective, weak, tender, susceptible, vulnerable) |