In a cursed, damned, or unfortunate manner (an extremely rare or archaic variant, possibly dialectal).
From 'curst' (cursed) plus '-ly,' though this form is so rare it may be a dialectal or obsolete variant rarely documented in standard dictionaries.
This word is so obscure that even language historians would struggle to find historical examples—it might be the English equivalent of a linguistic ghost!
Complete word intelligence in one call. Free tier — 50 lookups/day.