A chinless wonder
Definition 1 of 1
Pro Tip 1/3Social Status
Used to criticize those from upper-class backgrounds who appear incompetent or lack leadership qualities. 
Despite his fancy title, everyone viewed him as a chinless wonder who couldn't make decisions.
Pro Tip 2/3Colloquial Use
This phrase is informal and could be interpreted as offensive or humorous, depending on the context. 
At the party, he joked that his supervisor is a chinless wonder.
Pro Tip 3/3Cultural Nuance
Understanding British class stereotypes can help learners appreciate the phrase's full meaning. 
She called him a chinless wonder, poking fun at his aristocratic air and lack of practical skills.