| infertil | infertile |
| Infertilität | infertility |
| infantil | infantile |
| unfertig | crude |
| fertil | fertile |
| Insertio | minionette |
| infektiös | infectious |
| Infekt | infection |
| Infektion | infection |
| Inferenz | inference |
| Inferno | inferno |
| fertig | ready done finished exhausted |
| Hinterteil | tail rear |
| einwertig | univalent monovalent |
| inert | inert |
| innert | inside |
| intertidal | intertidal |
| einfarbig | monochrome |
| einförmig | humdrum monotonous |
| informell | casual informal |