马虎 (mǎ hu): careless, sloppy

He was too careless during the exam and even wrote his name wrong.

Mom always reminds me not to be careless before going out and to check my wallet and keys.

He is very careless at work and often forgets to reply to clients' emails.

The experiment data were wrong this time because Xiao Wang was too careless and didn't check carefully.

You must never be careless when driving; even a small mistake can cause an accident.