| erforderlich | necessary |
| förderlich | beneficial conducive |
| Erfordernis | need demand requirement |
| erfreulich | pleasant pleasing |
| erfinderisch | clever |
| erfolgreich | successful |
| erforderlichenfalls | if necessary where necessary |
| erfordern | require |
| verwunderlich | amazing bizarre |
| Roderich | Roderick |
| absonderlich | odd weird strange |
| brüderlich | brotherly fraternal |
| sonderlich | espacial particular special peculiar |
| veränderlich | changeable mutable alterable |
| körperlich | bodily corporal corporeal material |
| Erfinderin | inventor |
| unerfreulich | unpleasant |
| förmlich | punctilious formal directly |
| unförmlich | informal |
| forstlich | forestal silvicultural |