| Infinitive | Participle | Gerund | Adjective |
|---|---|---|---|
| unbill | unbilled | unbilling | unbillable |
| unkemp | unkempt | unkemping | unkempable |
| unmenace | unmenaced | unmenacing | unmenaceable |
| unnotice | unnoticed | unnoticing | unnoticeable |
| unprepare | unprepared | unpreparing | unpreparable |
| unscath | unscathed | unscathing | unscathable |
| unseason | unseasoned | unseasoning | unseasonable |
| unsee | unseen | unseeing | unseeable |
| unst | unsted | unsting | unstable |
| unwash | unwashed | unwashing | unwashable |