等于not ... at all，表示从来不，例如：
1、'You don't feel that you've betrayed your country?' — 'Not at all， I think I've done a service to my country.'“你不觉得你背叛了你的祖国吗”——“一点也不，我认为我帮了我的国家。”
2、Apparently the girls are not at all amused by the whole business.据说女孩们觉得整件事情一点也不好笑。
3、What looks obvious in hindsight was not at all obvious at the time.事后一目了然的在当时根本看不清。
