Definition of "wantonly"

Undoubtedly Madam—and it has always been a sentiment of mine—that to propagate a malicious Truth wantonly—is more despicable than to falsify from Revenge […]

1777, Richard Brinsley Sheridan, The School for Scandal, II.ii

I believe that I have no enemy on earth, and none surely would have been so wicked as to destroy me wantonly.

1818, Mary Shelley, chapter 8, in Frankenstein‎, archived from the original on 3 April 2012