not at all idiom
B1 （用于对致谢的礼貌回答）别客气
used as a polite reply after someone has thanked you
"Thanks for helping." "Not at all." “谢谢你的帮助。”“别客气。”
B2 （用于表达强烈的否定）一点也不
used to say "no" or "not" strongly
"I hope it wasn't too much hassle for you." "No, not at all." “我希望没有太麻烦你。”“不，一点也不。”
I'm not at all happy about it. 我对此一点都不满意。