Clumsy or awkward workmanship; poorly made or botched — indicating lack of skill or inelegant construction.
この棚は不細工な作りで、すぐに歪んでしまった。
This shelf was poorly made and warped quickly.
手先が不細工で細かい作業は苦手だ。
I'm clumsy with my hands and bad at detailed work.
彼の字は不細工だが、気持ちは伝わる。
His handwriting is sloppy, but the feeling comes through.
Informally describes someone as unattractive or ugly. 'Busai(ku)' is slang and can be rude when used toward a person.
写真写りが悪くて不細工に見えるだけだよ。
You just look ugly in the photo because of bad photography.
そんなに不細工だなんて言わないでほしい。
Please don't tell me I'm ugly like that.
彼は自分の顔が不細工だと悩んでいる。
He worries that his face is unattractive.