This is the 1737th most frequent Chinese word.
安心
"安心" means "peace of mind" or "relief."
This usage of "安心" implies a state of mental peace or comfort due to external assurances or safety.
在这个安全的环环境中,我能感到安心。
In this safe environment, I can feel at ease.
In this sentence, "安心地" modifies the verb "接受" to describe the manner in which the action is carried out—calmly and without worries.
她安心地接受了我的建议。
She peacefully accepted my advice.
Here, "安心" is used in a causative context, referring to the act of relieving others' concerns or worries.