half-caste vs underbred

half-caste

adj

Of mixed racial descent.

noun

A person of mixed racial descent.

underbred

adj

Of inferior breeding or upbringing; vulgar, lacking in manners or finesse.
Not purebred; of an inferior strain.

How often have the words half-caste and underbred occurred in a corpus of books? (source: Google Ngram Viewer )