ケアレスミス

noun

careless mistake; slip; blunder

A mistake made due to inattention or lack of care, often in work, tests, or daily tasks. Common in business and educational contexts.

• テストでケアレスミスをして、簡かん単たんな問もん題だいを間ま違ちがえた。

  I made a careless mistake on the test and got a simple question wrong.

• 書しょ類るいのケアレスミスに気きづいて、すぐに修しゅう正せいした。

  I noticed a careless mistake in the document and corrected it immediately.