IPA: /ɪˈrɛpərəbli/
KK: /ɪˈrɛpərəbli/
In a way that cannot be fixed or repaired.
The damage to the car was done irreparably after the accident.
Irreparably → It is formed from "in-" (meaning not), "reparare" (meaning to repair), and "-ly" (a suffix forming adverbs). The word means in a manner that cannot be repaired or fixed.
Think of 'not' ('in-') being able to 'repair' ('reparare') something — that's why irreparably means it cannot be fixed.