| Krankheit | disease illness sickness |
| krankhaft | pathological patologic |
| krank sein | ail |
| Erbkrankheit | hereditary disease |
| Kranke | sick person |
| Kranker | sick person |
| Seekrankheit | sea-sickness seasickness |
| kränkeln | ail |
| kränken | offend hurt one's feelings |
| Keckheit | sauciness |
| Ganzheit | wholeness |
| Kahlheit | baldness |
| Kargheit | baldness |
| Knappheit | brevity closeness |
| Mannheit | virility |
| Kindheit | childhood infancy |
| Klarheit | clearness |
| Kühnheit | boldness daringness |
| Trägheit | idleness inertia |
| Autokrankheit | carsickness |