Irreparable

adjective/ir-REP-uh-ruh-buhl/

Meaning

So badly damaged or broken that it can never be fixed or put right again.

In context
Spreading that rumour did irreparable harm to their friendship.

Remember it

'Ir' (not) + 'repair' + 'able' = NOT able to be repaired, so it stays broken forever.

Use it well

Use for serious, lasting harm to things or relationships, not for small everyday breakages.