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Ineptness (noun)
The quality or degree of being inept.
“The ineptness of the novice jugglers was apparent as they frequently dropped their juggling pins.”
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Ineptitude (noun)
The quality of being inept.
Wiktionary
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Ineptitude (noun)
lack of skill or ability
“the sheer ineptitude of their economic plan”
“the officials displayed remarkable ineptitude”
Oxford Dictionary