1.
(of a cruel or violent action) deliberate and unprovoked.
"sheer wanton vandalism"
synonyms: deliberate, willful, malicious, spiteful, wicked, cruel; More
gratuitous, unprovoked, motiveless, arbitrary, groundless, unjustifiable, needless, unnecessary, uncalled for, senseless, pointless, purposeless, meaningless, empty, random;
capricious
"wanton destruction"
antonyms: justifiable
2.
(especially of a woman) sexually immodest or promiscuous.
synonyms: promiscuous, immoral, immodest, indecent, shameless, unchaste, fast, loose, impure, abandoned, lustful, lecherous, lascivious, libidinous, licentious, dissolute, debauched, degenerate, corrupt, whorish, disreputable
"a wanton seductress"
antonyms: chaste
3.
archaic
growing profusely; luxuriant.
"where wanton ivy twines"
lively; playful.
"a wanton fawn"