expression, i-adjective
bad-mannered; naughty; misbehaving
Describes a child or person whose behavior lacks proper manners; often used in a scolding or playful tone.
あの子は行儀悪いから、注意したほうがいいよ。
That kid has bad manners, so you should tell them off.
食事中に行儀悪いことをしてはいけません。
You mustn't misbehave during meals.
Antonym meaning well-mannered or well-behaved.
Compound of 行儀 (manners, etiquette) and 悪い (bad). The form without が is a compact i-adjective expression.