na-adjective, noun
Describes something profound and difficult to grasp, often with a mystical or esoteric nuance. Relatively literary and not an everyday word.
その哲学書は玄妙な理論で満ちている。
That philosophy book is full of abstruse theories.
彼の言葉には玄妙なところがあって、すぐには理解できない。
His words have a mysterious quality that makes them hard to understand right away.