请教这句话的翻译

Bruce was not in the least perturbed.
貌似双重否定,但不知如何翻译

【oxford】not in the least absolutely not; not at all 绝对不; 一点也不: It doesn\'t matter in the least. 那绝对不要紧. * `Would you mind if I put the television on?\' `No, not in the least.\' ‘我开电视机影响你吗?’‘一点都不影响.’

【collins】You can use in the least and the least bit to emphasize a negative. 强调否定。
I\'m not like that at all. Not in the least.
I\'m not in the least bit touched by the Marilyn Monroe kind of beauty.
Alice wasn\'t the least bit frightened.

[collins]If someone is perturbed by something, they are worried by it. (FORMAL)
He apparently was not perturbed by the prospect of a policeman coming to call.
She was really quite perturbed at the prospect

所以并不是双重否定，
你的那句话意思为：布鲁斯一点儿都不担心。

但看书上说:in the least是一点也不,完全不的意思
not in the least也是绝对不; 一点也不的意思吗??

什么书？这本书可能有点问题。
看看
【collins】You can use in the least and the least bit to emphasize a negative. 强调否定。
in the least 只是一种强调否定语气的短语而已。
类似于 I do enjoy my experience. 中的do,加强肯定语气。

是新概念3上的
39课的,估计是书上错了