na-adjective, noun which may take the genitive case particle 'no', taru-adjective, adverb taking the 'to' particle
very ordinary; mediocre; all-too-common; quite commonplace
A yojijukugo emphasizing extreme ordinariness or lack of distinction. Often used with a negative or dismissive nuance.
彼の経歴は平平凡凡たるものだった。
His career was utterly ordinary.
平平凡凡な毎日に少し刺激が欲しい。
I want a little excitement in my very ordinary daily life.