chinlessadj1 having a small chin, regarded as a sign of a weak character 小下巴的（视为性格懦弱的标志）.2 (idm 习语) a chinless `wonder (Brit infml 口) (esp young upper-class) person with a weak character （尤指上层社会的青年）性格懦弱者.
牛津英汉双解词典