noun, na-adjective, noun which may take the genitive case particle 'no'
ordinary and ignorant; mediocre and stupid
A strong, literary insult describing someone as both unremarkable and foolish. Rare in everyday speech; mostly found in formal or written criticism.
His opinion is mediocre and stupid, not worth listening to.
An ordinary and ignorant person probably wouldn't understand the value of this art.
A compound of 凡庸 (mediocre, ordinary) and 愚昧 (foolish, ignorant). The exact historical derivation is uncertain, but the combination intensifies the negative assessment.