IPA: /ɪnˈkɒmpɪtəns/
KK: /ɪnˈkɑːmpɪtəns/
The quality of not being able to do something properly or effectively.
His incompetence in handling the project led to many mistakes.
Incompetence → It is formed from "in-" (meaning not) and "competent" (from Latin "competens", meaning suitable or qualified). The word "incompetence" refers to the state of not being suitable or qualified for a task or role.
Think of 'not' ('in-') being combined with 'suitable' ('competent') — this helps you remember that incompetence means not being suitable or qualified.