to be enigmatic; to be puzzling; to be wrapped in mystery
彼女の謎めいた微笑みに惹かれた。
I was drawn to her enigmatic smile.
その古い屋敷は謎めいて、誰も近づかない。
That old mansion is enigmatic, and no one approaches it.
彼の経歴は謎めくばかりで、同僚たちでさえその真実を知らない。
His background is nothing but mysterious, and even his colleagues don't know the truth.