noun
amateur performance; amateur skill
Refers to a performance or skill that is clearly amateurish, often with a nuance of being unpolished or endearingly clumsy. Can be used both critically and affectionately.
彼の歌は素人芸だけど、味がある。
His singing is amateurish, but it has charm.
素人芸とは思えないほど上手だった。
It was so good you wouldn't think it was an amateur performance.