This was probably the most insufferable social event of a very dull season. The bride blushingly gave her age as forty-two, but the old battle-axe could have been an eye-witness to the San Francisco Fire. At long last, little Dagmar's folks have got her married off to Morty, the chinless wonder. He couldn't hold down a job as grocery clerk, and will be manager of father-in-law's wholesale grocery firm.

She is thin, starved to near perfection […] He, a chinless wonder, a credit to Carnaby Street; they stand hand in hand before the enquiry desk

[Actor] John Harding personified the idle spirit of the times as a tennis-possessed chinless wonder.

Chinless wonder

Meaning

Noun