Rare, literary word for something eerie, uncanny, or inexplicably odd. Not used in everyday conversation; modern equivalents include 不思議な or 奇妙な.
Weird rumors never cease about that old mansion.
His story is somehow mysterious and hard to believe right away.
Ateji spelling; the word is rare and literary. The kanji 面妖 are used phonetically.
Kana spelling is practical for this rare ateji word.
The kanji 面妖 are ateji (phonetic) for the reading めんよう. The exact origin of the word is uncertain, but it is a rare literary term.