least of all尤其不I don't like rain or storms, and least of all thunder.我不喜欢下雨和暴风雨，尤其不喜欢打雷。
not least相当重要Trade has been bad, not least because of increased costs.生意一直不好，相当重要的原因是价格上涨。
at least起码He's going away for atleast a week.他起码一星期出去一次。
at the least至少，最少