abandon
noun
the trait of lacking restraint or control; reckless freedom from inhibition or worry
“she danced with abandon”
a feeling of extreme emotional intensity
“the wildness of his anger”
Synonymswildness
verb
forsake, leave behind
“We abandoned the old car in the empty parking lot”
give up with the intent of never claiming again
“Abandon your life to God”
“She gave up her children to her ex-husband when she moved to Tahiti”
Synonymsgive upleave behind empty; move out of
“You must vacate your office by tonight”
stop maintaining or insisting on; of ideas or claims
“He abandoned the thought of asking for her hand in marriage”
“Both sides have to give up some claims in these negotiations”
Synonymsgive upleave someone who needs or counts on you; leave in the lurch
“The mother deserted her children”
Source: WordNet 3.1, Princeton University