alacrity - willingness
If you do something with ‘alacrity’, you do it quickly and with eagerness or enthusiasm. It is a formal word and tends to be used more in writing than in everyday conversation.
The alacrity with which she carried out the task was an example for everybody on the team.
He didn’t directly ask for money, but when I offered him a loan he accepted it with alacrity.
The work was not done with sufficient alacrity, so we missed the deadline.