Noun chinless wonder (plural chinless wonders) (Britain, derogatory) An ineffectual upper-class man, typically dim-witted and of a weak or indecisive character, frequently one who gained his position through nepotism or social connections.
Quite right about the ‘burgs, but I wasn’t thinking about the British royals. Must have been a different continental royal house, about whom it was joked that they couldn’t be hanged because no chins.
[snip] Numerous members of the family showed specific facial deformities: an enlarged lower jaw with an extended chin known as mandibular prognathism or “Habsburg jaw”, a large nose with hump and hanging tip (”Habsburg nose”), and an everted lower lip (”Habsburg lip”). The latter two are signs of maxillary deficiency. A 2019 study found that the degree of mandibular prognathism in the Habsburg family shows a statistically significant correlation with the degree of inbreeding. A correlation between maxillary deficiency and degree of inbreeding was also present but was not statistically significant.[21][22] Other scientific studies, however, dispute the ideas of any linkage between fertility and consanguinity. [/snip] https://en.wikipedia.org/wiki/House_of_Habsburg