wan·ton:
(of a cruel or violent action) deliberate and unprovoked.
"sheer wanton vandalism"
synonyms: deliberate, willful, malicious, malevolent, spiteful, vicious, wicked, evil, cruel; unprovoked, unmotivated, motiveless, arbitrary, groundless, unjustifiable, unjustified, needless, unnecessary, uncalled for, gratuitous, senseless, pointless, purposeless, aimless, useless, meaningless, empty, vacuous
"wanton destruction"
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