less + adj/adv (than ...)
less 修饰形容词或副词原级，构成比较级，表示‘不如’。
This book is less interesting than the movie.
这本书没有那部电影有趣。
较少；更少
用于构成某些形容词和副词的比较级；little的比较级；较小；较差；[计] 最低成本估算与调度法
to a smaller degree or extent; not so much
用于构成某些形容词和副词的比较级
used to form the comparative of some adjectives and adverbs
little的比较级
comparative of little
This book is less expensive than that one.
这本书比那本便宜。
用法提示：less修饰形容词expensive，构成比较级
He speaks less loudly than his brother.
他说话比他哥哥声音小。
用法提示：less修饰副词loudly，构成比较级
She runs less quickly than her friend.
她跑得没有她的朋友快。
用法提示：less修饰副词quickly，构成比较级
less 修饰形容词或副词原级，构成比较级，表示‘不如’。
This book is less interesting than the movie.
这本书没有那部电影有趣。
表示程度递减，意为‘越来越少’。
He goes out less and less.
他越来越少出门。
less than 后接数量，表示‘少于’。
The journey took less than three hours.
这段旅程用了不到三个小时。
用于‘the + 比较级’结构，表示‘越……越……’。
The less you worry, the less you suffer.
你越少担忧，就越少受苦。
grammar · medium
易错句子There are less students in the classroom today.
正确表达There are fewer students in the classroom today.
less 修饰不可数名词；students 是可数名词复数，在标准书面英语中要用 fewer 修饰可数名词复数，所以把 less 改成 fewer。
grammar · medium
易错句子My brother is less taller than me.
正确表达My brother is less tall than me.
less 本身已构成比较级，后面须接形容词原级，不能再接另一个比较级 taller，否则成为双重比较；因此 taller 要改回原级 tall。
grammar · medium
易错句子She is less confident as her sister.
正确表达She is less confident than her sister.
由 less 构成的比较结构用 than 引出比较对象，不能套用 as ... as 结构里的 as；这里要把 as 改成 than。
少于；不到
It costs less than ten dollars.
这个不到十美元。
不太可能
Children who read a lot are less likely to struggle in school.
读书多的孩子在学校不太容易跟不上。
比较便宜；没那么贵
Taking the bus is less expensive than driving.
坐公交车比开车便宜。
没那么重要
Looks are less important than personality.
外表没有性格那么重要。
越来越少
He exercises less and less these days.
他这些天锻炼得越来越少。
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相比之下没那么……
The first movie was scary; the second, less so.
第一部电影很吓人，第二部则没那么吓人。