| inflationär | inflationary |
| Inflation | inflation |
| instationär | transient |
| Infixation | infixation |
| Infektion | infection |
| Deflation | deflation |
| Inhalation | inhalation |
| Isolation | insulation isolation |
| relational | relational |
| kreationär | creationarily |
| irrational | irrational |
| national | national |
| stationär | stationary |
| evolutionär | evolutionary |
| intentional | intentional |
| illusionär | illusory illusional illusionary |
| Infestation | infestation |
| Informationen | lowdown |
| infektiös | infectious |
| Infiltration | infiltration |