IPA: /ɪˈnɛpt.nəs/
KK: /ɪˈnɛptnəs/
The state of being unskilled or clumsy in a particular task or activity.
His ineptness at handling the situation led to further complications.
Ineptness → It is formed from "inept" (from Latin "ineptus", meaning unsuitable or unfit) and "-ness" (meaning the state or quality of). The word "ineptness" refers to the state of being unsuitable or lacking skill.
Think of someone being 'unsuitable' or 'unfit' ('inept') for a task, and the '-ness' indicates the quality of that state.