无愧的英文：
feel no regret

Not ashamed of the inner rulers
内则无愧

Not ashamed of one’s post
无愧厥职

feeling of efficacy
效力感

Has a feeling for language.
对语言有领悟力

You can feel the electricity in the crowd.
你可感到群众的激情。

experience or feel; submit to.
经历或者感觉；使服从。

Savour the feeling of change.
尽情享受改变的滋味。

regret rushed decisions
对贸然做出的决定感到懊悔

It is the order of nature, and regret is useless.
这是自然的法则，悲叹惋惜是无用的。

I regret my mistake.
我为自己所犯错误感到懊悔。

He felt a flicker of regret.
他突然闪现一丝悔意。

He regretted his roughness.
他对自己的粗鲁感到后悔。