IPA: //ʌnˈriːpɪtəbl//
KK: /ʌnˈriːpɪtəbl/
Something that cannot be done again or repeated.
The artist created an unrepeatable masterpiece that left everyone in awe.
Unrepeatable → It is formed from "un-" (meaning not) and "repeat" (from Latin "repetere", meaning to do again) and "-able" (meaning capable of). The word "unrepeatable" means not capable of being repeated.
Think of 'not' ('un-') being able to 'do again' ('repeat') — that's why unrepeatable means something that cannot be done again.