| unknackbar | uncrackable |
| undankbar | ungrateful |
| unkündbar | binding permanent |
| Knacker | buster |
| Nachbar | neighbour neighbor |
| undenkbar | unthinkable |
| untrinkbar | undrinkable |
| unsinkbar | unsinkable |
| unbrauchbar | bogus unusable |
| unbrechbar | uncrackable |
| unfaßbar | abstruse |
| unfassbar | inconceivable incomprehensible unfathomable incredible unbelievable |
| unlöschbar | inextinguishable |
| unsagbar | preposterous |
| unwählbar | unelectable |
| unantastbar | inviolable untouchable indefeasible |
| unhaltbar | untenable |
| unwägbar | immeasurable unmeasurable |
| unzählbar | uncountable |
| unklar | ambiguous indistinct |