comfortably; pleasantly; cheerfully
Describes a comfortable, pleasant state or manner, often used with verbs like 過ごす, 眠る, or 笑う.
新しいソファで快く過ごせた。
I was able to spend time comfortably on the new sofa.
彼女は快く笑ってくれた。
She gave a cheerful laugh for me.
Expresses doing something with a willing, positive attitude, often in response to a request or invitation.
彼は快く手伝ってくれた。
He willingly helped me.
快く引き受けてください。
Please accept it gladly.
快く means doing something willingly and cheerfully, the opposite of 渋々's grudging reluctance.
Derived from the adjective 快い (こころよい, 'pleasant, agreeable') in its adverbial form. The kanji 快 means 'pleasant' or 'comfortable'.