(literary) dim; dusky; dark and hazy

the underworld or realm of the dead

(literary) the distant sky; high and far away; sometimes used to refer to a place of reclusive retirement

unseen or mystical powers that govern human fate (often in the phrase 冥冥之中 míng​míng​zhī​zhōng)

benighted; muddle-headed; ignorant

(literary) in private; secretly; behind people's backs