wantonness

名词 wantonness:

1. the trait of lacking restraint or control; reckless freedom from inhibition or worry
   同义词：abandon, unconstraint
2. the quality of being lewd and lascivious
   同义词：licentiousness

1. I kicked my son because of his wantonness.
   因为我儿子的任性，我踢了他。
2. The wantonness of the girl's character annoyed us.
   那个女孩变化无常的性格让我们很生气。