粗心大意 (cū xīn dà yì): Careless / Negligent (adjective/idiom) — Meaning & Stroke Order

Because he was careless, he left the important documents in the taxi.

He carelessly left the important documents in the taxi.

Xiao Ming was careless and wrote the wrong answer during the exam.

Being careless at work may lead to serious mistakes, so we must take every detail seriously.