| fieberlos | afebrile |
| filterlos | filterless |
| kieferlos | jawless |
| Fieber | fever |
| Fieberblase | fever blister |
| fiebern | have a fever |
| lieblos | loveless uncaring |
| Fiberglas | fiberglass fibreglass |
| fahrerlos | driverless |
| gliederlos | inarticulate |
| fehlerlos | flawless |
| kinderlos | childless |
| wirbellos | invertebrate |
| Fiesel | pizzle |
| fieberfrei | afebrile |
| Fiedel | fiddle |
| fieberhaft | feverish |
| fiebrig | feverish |
| fiedeln | fiddle |
| Kieberer | pig |