less 与 more 都可构成比较级，less 构成比较级与 more 构成比较级的意义恰好相反，表“不像……；不如……；不及……”等意义。如：

Jane is less beautiful than Susan. 简不如苏珊漂亮。《英汉多功能词典》

He is less fat than he was. 他没有以前那样胖。《21世纪英汉汉英双向词典》

Tickets were less expensive than I had expected. 票比我预想的更便宜。《朗文当代英语词典》