| Klarheit | clearness |
| Unklarheit | unclearness |
| Klartext | cleartext straight talk |
| Kargheit | baldness |
| Klugheit | prudence |
| Klathrat | clathrate |
| Klärwerk | sewage treatment plant sewage work wastewater treatment plant |
| klären | clarify clear settle purge treat |
| Leerheit | emptiness |
| Mehrheit | majority bulk plurality |
| Narrheit | folly |
| Sturheit | stubbornness obstinacy |
| Torheit | folly |
| Wahrheit | truth |
| Flachheit | flatness |
| Kahlheit | baldness |
| Keckheit | sauciness |
| Kessheit | sauciness |
| Kleinheit | smallness |
| Knappheit | brevity closeness |