To one's heart's content; with all one's strength; as much as one wants — an adverb expressing doing something fully or intensely.
休日は思い切り寝てリフレッシュしたい。
I want to sleep in and fully refresh myself on my day off.
彼は思い切りボールを蹴った。
He kicked the ball with all his strength.
思い切り泣いて気持ちが楽になった。
Crying my heart out made me feel better.
試験のために思い切り勉強した。
I studied very hard for the exam.
Resolution; decisiveness; the determination to do something without hesitation.
転職するには思い切りが必要だ。
You need determination to change jobs.
思い切りのよさが彼の長所だ。
His decisiveness is one of his strengths.