平平凡凡 (へいへいぼんぼん) — very ordinary; mediocre; all-too-common; quite commonplace
平平凡凡
へいへいぼんぼん
へ い へ い ぼ ん ぼ ん
Adjectival nouns or quasi-adjectives (keiyodoshi), nouns which may take the genitive case particle 'no', 'taru' adjective, adverb taking the 'to' particle, yojijukugo
Very ordinary; mediocre; all-too-common; quite commonplace