| Intoleranz | intolerance |
| intolerant | intolerant |
| Toleranz | tolerance |
| tolerant | tolerant |
| Indolenz | idleness |
| Insolenz | boldness |
| Intonierung | intonation |
| Integrand | integrand |
| Interferenz | interference |
| intern | internal |
| Nulltoleranz | zero tolerance |
| indolent | indolent |
| insolent | ill-mannered impertinent insolent |
| Ignoranz | ignorance bigotry inobservance |
| Irrelevanz | irrelevance irrelevancy |
| Hinterarm | upper arm |
| Interferon | interferon |
| Interrex | interrex |
| Interval | range |
| Sintern | sintering |
| sintern | sinter bake coalesce slag vitrify |