| in flagranti | in flagrante delicto red-handed |
| flagrant | flagrant |
| in Flammen | ablaze |
| intolerant | intolerant |
| in Brand | on fire |
| in Kraft | in force |
| Flatrate | flatrate |
| Inflation | inflation |
| inflationär | inflationary |
| Immigrantin | immigrant |
| Immigrant | immigrant |
| Integrand | integrand |
| Deklarant | declarant |
| Deklarantin | declarant |
| Intoleranz | intolerance |
| Informant | ear informant |
| Informantin | informant |
| intrigant | conniving |
| Intrigant | intriguer |
| unelegant | dowdy |