1. **Less**（反义词More） -- 修饰不可数名词/抽象概念：less water（更少水）, less importance（更低重要性） -- 比较级结构：less + adj/adv（less expensive 更不昂贵） -- 特殊用法：no less than（不少于）, less than perfect（不完美）
2. **Lesser** -- 仅用于可数名词前：the lesser evil（两害相权取其轻） -- 隐含比较范围（多指两者间）：the lesser-known candidate（知名度较低的候选人） -- ...(以上内容有节略,please sign in for more)500
【Less】 , 【lesser】 , 【smaller】 , 【fewer】 are comparable terms that approach each other in meaning but are not synonyms and are rarely interchangeable.
【Less】 means not as much, especially in degree, value, or amount, and its opposite is usually more. It applies chiefly to collective nouns or nouns denoting a mass or abstract whole.
【Lesser】 means not as great, as important, or as significant as that with which the thing so qualified is compared and implies opposition to greater or major. In vernacular names 【lesser】 implies that the kind of plant or animal so designated is distinguished from a very similar one carrying the same name chiefly by its comparative smallness of size.
【Smaller】 means not as large as that with which the thing so qualified is compared (as in size, dimensions, or quantity).
【Fewer】 means not as many and implies a difference in number of individuals or units; the term therefore modifies a plural noun.
