"Punctilious in his attention to rules of etiquette."
1634, probably from It. puntiglioso, from puntiglio "fine point", from Latin punctum "prick" (see point).
Punctilous is a British Thoroughbred racehorse and broodmare. Bred in England by Björn Nielsen she showed very promising form as a juvenile in 2003, winning her first two starts before finishing third in the Fillies' Mile.