Extended Strong's Greek Lexicon (Abbott-Smith based)
boastful
Usage: ὑπέρ-ογκος, -ον [in LXX: Deu.30:11 (פָּלָא), etc. ;] of excessive weight or size; metaphorically, excessive, immoderate, in late writers, of arrogant speech (see Mayor on Ju, l.with): n. pl., 2Pe.2:18, Ju 16.† (AS)