Alazoneia (G212) is a distinctive Greek vice — the arrogance of the alazōn, a type who overstates himself, makes empty boasts, and trusts in his own resources. James 4:16 rebukes those who boast in their business plans, calling it evil alazoneia. John links it with 'the boastfulness of life' (alazoneia tou biou) — worldly pride in possessions.
Alazoneia is pride that operates in the realm of false self-sufficiency. James's example of the merchant making confident plans without acknowledging God (James 4:13–16) is the archetype. John lists it alongside lust as a sign of the world's system (1 John 2:16). The antidote is not low self-esteem but tapeinophrosynē — humble-mindedness that acknowledges God as the source of all plans and outcomes.