| Infekt | infection |
| infektiös | infectious |
| Infektion | infection |
| Insekt | insect bug |
| Infant | infante |
| Infarkt | infarction |
| Konfekt | candy |
| Affekt | affect |
| Defekt | defect fault deficiency |
| defekt | defective damage |
| Effekt | effect |
| Infos | lowdown |
| Einfalt | naivete |
| Inferno | inferno |
| Infix | infix |
| Info | info |
| hinfort | henceforth |
| infam | infamous |
| infaust | infaust |
| infertil | infertile |