Calling someone unintelligent because they made a mistake is unfair and unkind.

He answered the question unintelligently, confusing the whole class.

The lecture notes were so smudged that many lines of text became unintelligible to the students.

He mumbled unintelligibly during the meeting, leaving everyone confused.

The unintelligibility of the recording made it impossible to transcribe the interview.

The unintelligibleness of her explanation left everyone confused.

The committee's report revealed several unintelligences in the proposed plans.

The committee attributed the scandal not to malice but to simple unintelligence.

The transcript failed to capture the lecture's unintelligibilities, leaving many students confused.

The company's new customer service bot became notorious for its artificial unintelligence, failing to understand simple requests.