1. in a deliberate and unprovoked way; without justification or restraint
2. in a sexually immodest or promiscuous manner
Usage: often considered offensive

Examples

• The vandals wantonly destroyed the public artwork.
• He wantonly ignored the safety regulations.
• The soldiers were accused of wantonly attacking civilians.
• She wantonly spent her inheritance on luxury items.
• The company wantonly polluted the river for decades.
• The dictator wantonly imprisoned his political opponents.