Στρηνιάω describes living in luxury, wantonness, and sensual excess—not merely wealth but arrogant self-indulgence and revelry. In Revelation 18, this verb characterizes Babylon's (symbolic Rome's) relationship with the merchants and kings of earth. Babylon has 'lived luxuriously' (18:7) in pride and sensuality, and the merchants mourn because she who 'lived in luxury' with them (18:9) is now judged. The term suggests wanton excess, sexual immorality, and the intoxication of power and pleasure. It's stronger than merely living comfortably—it implies shameless, arrogant indulgence that ignores God and exploits others.