abandon

A state of complete lack of inhibition or restraint.

"They danced with wild abandon all night."

To leave a place, person, or thing permanently, often carelessly.

"They had to abandon their car on the motorway."

To cease to support or pursue something; to give up completely.

"The company decided to abandon the failing project."

To give oneself over completely to an emotion or impulse.

"She abandoned herself to the music."