In your vauntings (en tais alazoniais humōn). Old word for braggart talk (from alazoneuomai, to act the alazōn empty boaster Rom 1:30), common in Aristophanes, in N.T. only here and 1Jo 2:16.
Glorying (kauchēsis). Act of glorying, late word from kauchaomai, good if for Christ (1Th 2:19), bad if for self as here.