careful; cautious; prudent; discreet; deliberate
rash; thoughtless; careless; hasty; imprudent
この問題は慎重に扱う必要がある。
This issue needs to be handled carefully.
彼女は何事にも慎重な人だと思う。
She is a cautious person in everything.
もっと慎重に行動すべきだった。
I should have acted more cautiously.