夜郎自大 [ㄧㄝˋ ㄌㄤˊ ㄗˋ ㄉㄚˋ; ye4 lang2 zi4 da4]
lit. Yelang thinks highly of itself (idiom)
fig. foolish conceit
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夜郎自大
やろうじだい
adjectival nouns or quasi-adjectives (keiyodoshi)
noun (common) (futsuumeishi)
throwing one's weight around in a small group without knowing one's real worth in a larger world outside
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