wanton - vocabulary
Done, used, or shown maliciously, without justification; done without motive or provocation, headstrong; without regard for right and wrong; sexually loose, lascivious; excessively luxurious.
At this moment, my small daughter being out, I am acting as nurse to two wee guinea pigs, which she feels would not be safe save in the room with me—and if I can prevent it I do not intend to have wanton suffering inflicted on any creature.
—Theodore Roosevelt Theodore Roosevelt’s Letters to His Children (1919)
© Grammar.com