petulancy
/ˈpɛtjʊlənsi/ /ˈpɛtjʊl(ə)nsi/ /ˈpɛtʃʊlənsi/Now rare
noun
Childish impatience or sulkiness; irritability, tetchiness.
Origin
Mid 16th century (in an earlier sense). From classical Latin petulantia impudence, rudeness from petulant-, petulāns + -ia; compare -ancy.