The Collaborative International Dictionary
Curstfully
Curstfully \Curst"ful*ly\ (-f[.u]l*l[y^]), adv.
Peevishly; vexatiously; detestably. [Obs.] ``Curstfully
mad.''
--Marston.
Wiktionary
curstfully
adv. (context obsolete nonce English) peevishly; vexatiously; detestably