| fastklibbande | adherent |
| fastklämd | jammed |
| fastklämning | clamping |
| fastlag | Shrovetide |
| fastlags- | lenten |
| fastlagsbulle | semla |
| fastland | mainland |
| Fastlandskeltiska språk | Continental Celtic languages |
| fastna | fasten |
| fastna i minnet | stick in one's memory |
| fastnar | adhesive |
| Fastnet Race | Fastnet race |
| Fastnet Rock | Fastnet Rock |
| fastsatt | cinched |
| fastsittande | fixed |
| fastsittande vid | adherence |
| fastslagen regel | hard-and-fast rule |
| fastslå | settle |
| fastslå genom dom | adjudicate |
