| unkonventionell | unconventional |
| konventionell | conventional |
| Konventionen | decorum |
| konzeptionell | conceptual |
| Konventikel | conventicle |
| Konvention | convention |
| funktionell | functional |
| unkommerziell | noncommercial |
| exponentiell | exponential |
| unprofessionell | nonprofessional |
| konjunktional | conjunctional |
| Inkontinenz | incontinence |
| inkontinent | incontinent |
| Konvenienzehe | marriage of convenience |
| Konditional | conditional conditional mood |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Konversion | conversion |
| Konzeption | conception |
| konstitutionell | constitutional |
| konvenient | convenient |