used with uncountable nouns to mean ‘a smaller amount of’ （与不可数名词连用）较少的，更少的 - less something
less butter/time/importance 较少的黄油／时间；次要 He was advised to smoke fewer cigarettes and drink less beer. 有人劝他少抽烟、少喝啤酒。 - less to do
We have less to worry about now. 现在我们要担忧的事少一些了。 - less of something
They say we should exercise and eat less of some kinds of fat. 他们说我们应该锻炼，少吃一些脂肪。 - less than…
We'll be there in less than no time (= very soon). 我们马上就到。 The victory was nothing less than a miracle. 这场胜利是个不折不扣的奇迹。 - less of something than…
It is less of a problem than I'd expected. 问题不像我预料的那么大。
Word OriginOld English lǣssa, of Germanic origin; related to Old Frisian lēssa, from an Indo-European root shared by Greek loisthos ‘last’.- less something
Idioms
less and less
smaller and smaller amounts; at a rate that is decreasing 越来越少 As time passed, she saw less and less of all her old friends at home. 随着时间的消逝，她越来越见不到家乡那些老朋友了。 There used to be TV shows that everyone would watch at the same time and talk about the next day, but that happens less and less. 以前有电视节目大家会同时看，第二天再聊，但是那种情况越来越少了。
less is more
no less
no less than…