chinless
adjective /ˈtʃɪnləs/
  /ˈtʃɪnləs/
Idioms - (of a man) having a very small chin (= part of the face below the mouth) (often thought of as a sign of a weak character)Oxford Collocations DictionaryChinless is used with these nouns:
- wonder
 
 
Idioms 
a chinless wonder 
- (British English, humorous, disapproving) a young, upper-class man who is weak and stupid