Wanton
adjective
occurring without motivation or provocation; ; - F.D.Roosevelt
“motiveless malignity”
Similar: motiveless, unprovoked
verb
waste time; spend one's time idly or inefficiently
Similar: piddle, wanton away, piddle away, trifle
verb
become extravagant; indulge (oneself) luxuriously
Similar: luxuriate
verb
indulge in a carefree or voluptuous way of life