noun
A straightforward loanword used in modern Japanese to describe something or someone that is not popular or well-liked. Often used in casual conversation and media.
彼の新しいアイデアは社内でアンポピュラーだった。
His new idea was unpopular within the company.
あの先生は生徒にアンポピュラーだ。
That teacher is unpopular with the students.