| incredible | you can't belive, suprsinig |
| illegible | can't read |
| incomprehensible | you can't understand |
| insoluble | you can't solve |
| insatiable | you are not satify with |
| unpardonable | you can't forgive |
| inevitable | can't avoid / nieuchronny |
| unpredictable | nieprzewidywalny |
| indispensable | niezbędny , you can't do without |