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Webster 1913 Edition

adv.

In a wanton manner; without regularity or restraint; loosely; sportively; gayly; playfully; recklessly; lasciviously.

Unintentionally; accidentally.

[Obs.]

J. Dee.

adv.

Loosely; without regularity or restraint; sportively; gayly; playfully; lasciviously.

wantonly ‎(comparative more wantonly, superlative most wantonly)

in a wanton manner
- 1818, Mary Shelley, chapter 8, in Frankenstein:
  I believe that I have no enemy on earth, and none surely would have been so wicked as to destroy me wantonly.