平々 へいへい凡々 ぼんぼん
heihei bombon

na-Adjective
no-Adjective
To-Adverb

1. very ordinary; mediocre; all-too-common; quite commonplace

Yojijukugo
かれほど平々 へいへい凡々 ぼんぼんたる主人 しゅじん こう めずらしい。
karehodo hēhēbombontaru shujinkōwa mezurashii.
A protagonist as plain and ordinary as him is rare indeed.
Other forms: