Definitions of curtness. an abrupt discourteous manner. synonyms: abruptness, brusqueness, gruffness, shortness. type of: discourtesy, rudeness. a manner that is rude and insulting. Is Curtness a noun? curtness noun – Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner’s Dictionary at OxfordLearnersDictionaries.com. How do you spell Curtness? 1. RudelyRead More →