alacrity
noun /əˈlækrəti/
/əˈlækrəti/
[uncountable] (formal)- great happiness or enthusiasm
欣然同意;十分乐意 - They accepted the offer with alacrity.
他们欣然接受了建议。
词源late Middle English: from Latin alacritas, from alacer ‘brisk’. - They accepted the offer with alacrity.