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From The Collaborative International Dictionary of English v.0.48:
Wantonly \Wan"ton*ly\, adv. 1. In a wanton manner; without regularity or restraint; loosely; sportively; gayly; playfully; recklessly; lasciviously. [1913 Webster] 2. Unintentionally; accidentally. [Obs.] --J. Dee. [1913 Webster]