abandon
US /əˈbæn.dən/
UK /əˈbæn.dən/

1.
leave (a place, thing, or person) permanently or with no intention of returning
:
•
We had to abandon the car.
•
The child was abandoned by its parents.
2.
give up completely (a course of action, a practice, or a way of thinking)
:
•
He abandoned his attempt to learn French.
•
The police were forced to abandon the search.
1.
complete lack of inhibition or restraint
:
•
She danced with wild abandon.
•
He played the music with reckless abandon.