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moron (B2)

カタカナ: モロン

IPA: /ˈmɔːrɒn/

A person who behaves in a very stupid or foolish way. It is a harsh, derogatory term used to insult someone's intelligence or actions.

意味: 非常に愚かな、あるいは馬鹿げた行動をとる人。知性や行動を侮辱するために使われる、きわめて辛辣で軽蔑的な言葉です。

I felt like a complete moron when I realized I had been holding my phone the whole time I was searching for it. — スマホを探している間ずっと手に持っていたことに気づいたとき、自分が完全に馬鹿だと思った。
Only a total moron would leave their keys inside a locked car on a freezing winter night. — 凍えるような冬の夜に、鍵をかけた車の中にキーを閉じ込めるなんて、相当な馬鹿だ。
Stop acting like a moron and listen to the instructions before you break something else. — 馬鹿な真似はやめて、何かを壊す前に説明を聞きなさい。

Japanese translations of Moron:

act like a moron (collocation): behaving in a stupid manner — "He tends to act like a moron whenever he is around his friends."
a total moron (collocation): an emphatic way to describe someone very stupid — "She realized her ex-boyfriend was a total moron after he forgot their anniversary for the third time."