least

名词 least:

1. something that is of no importance

形容词 least:

1. the superlative of `little' that can be used with mass nouns and is usually preceded by `the'; a quantifier meaning smallest in amount or extent or degree

副词 least:

1. used to form the superlative
   同义词：to the lowest degree

1. Least of all would I lie to you.
   我最犯不上对你撒谎了。
2. Mr. Brown talks least.
   布朗先生极少说话。
3. The least noise would startle the timid child.
   最小的响声也会吓着这个胆小的孩子的。

least

adj.（形容词）
little的最高级
Lowest in importance or rank.
最不重要的，地位最低的

Smallest in magnitude or degree.
最小的：在数量或程度方面最小的
Slightest or tiniest:
最轻微的：最轻的或最微小的：
例句：
didn`t care the least bit.
根本就不在乎

adv.（副词）
little的最高级形式
To or in the lowest or smallest degree.
最小地：达到或处于最低或最小的程度
n.（名词）
One that is the lowest or smallest in importance, rank, magnitude, or degree:
最低的事物，最小的事物：在重要性、地位、数量或程度方面最低或最小的事物：
例句：
The dinner menu is the least of my worries tonight. The least you can do is to be polite.
今晚我一点也不用担心晚餐的菜单。你至少可以礼貌点

<习惯用语>at least
According to the lowest possible assessment; not less than:
至少：根据最低可能的判断；不少于：
例句：
waited at least an hour.
至少等了一小时

In any event; anyway:
无论如何；不管怎样：
例句：
You might at least answer.
你不管怎样该给个答复

in the least
At all:
根本：
例句：
I don`t mind in the least.
我根本就不在意

least of all
Particularly not:
尤其不：
例句：
Nobody cared, least of all the manager.
没人在意，尤其是经理

来源：
Middle English
中古英语
from Old English lôst * see leis- 2
源自 古英语 lôst *参见 leis- 2