mysterious, subtle, exquisite
玅 centers on something deeply refined and hard to grasp: mysterious, subtle, or exquisitely delicate. The meanings share the idea of a quality that is not obvious or coarse.
玅 is a variant form of 妙, combining 玄 (dark, profound) and 少 (small, subtle). The components together suggest something small and profound, hence mysterious or exquisite.
The left side 玄 suggests something dark and profound, while the right side 少 means small or subtle. Together they create the idea of something so subtle and deep that it feels mysterious and exquisite.
For ミョウ, imagine a mysterious, subtle cat meowing softly: meow -> ミョウ, and the sound is as delicate and elusive as the kanji's meaning.