| unleugbar | undeniable |
| Unleugbarkeit | nonrepudiation |
| unbeugbar | indeclinable |
| unlesbar | indecipherable |
| unlösbar | insolvable |
| unbeugsam | grim |
| beugbar | inflectable declinable |
| belegbar | provable |
| unbewegbar | inanimate |
| unsagbar | preposterous |
| unwägbar | immeasurable unmeasurable |
| undenkbar | unthinkable |
| unessbar | inedible |
| unmessbar | immeasurable |
| unmeßbar | immeasurable |
| unfehlbar | infallible unfailing unerring |
| unheilbar | incurable irremediable irretrievable terminally |
| unteilbar | indivisible |
| unlöschbar | inextinguishable |
| unlauter | dishonest impure unfair |