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.
Means 'mediocre' or 'ordinary' without the strong 'ignorant' or 'stupid' connotation of 凡庸愚昧.
Means 'foolish' or 'ignorant' on its own, but 凡庸愚昧 combines both mediocrity and foolishness into a single harsh judgment.
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.