also: よいおとこ
noun
handsome man; good-looking guy
Refers to a man who is physically attractive. Often used in casual conversation.
彼は本当にいい男だね。
He's a really handsome guy, isn't he?
あの俳優はいい男で有名だ。
That actor is famous for being good-looking.
noun
Describes a man of good character, reliable, or admirable personality. Not about looks.
田中さんはいい男だ。いつも助けてくれる。
Tanaka-san is a good guy. He always helps out.
彼は口は悪いけど、本当はいい男なんだ。
He's rough-spoken, but deep down he's a great guy.
noun
Slang term within yakuza circles for a high-ranking or respected member. Not used in polite society.
あの組の若頭はなかなかのいい男らしい。
I hear that gang's young leader is quite an influential figure.
noun
Rare, old-fashioned term for a sumo wrestler, especially one of good physique or character. Mostly historical or literary.
昔の相撲取りは「いい男」と呼ばれることもあった。
In the old days, sumo wrestlers were sometimes called 'ii otoko'.