IPA: /ˌʌn.pərˈfɔːrmd/
KK: /ʌnˈpɜrˌfɔrmd/
Describing something that has not been carried out or executed.
The unperformed tasks were rescheduled for next week.
Unperformed → It is formed from "un-" (meaning not) and "performed" (from Latin "performare", meaning to carry out or accomplish). The word "unperformed" means not carried out or not accomplished.
Think of 'not' ('un-') doing something that has been 'carried out' ('performed') — that's why unperformed means something that hasn't been done.