'cursedly' originates from English, specifically formed by adding the adverbial suffix '-ly' to the adjective 'cursed' (the past participle of the verb 'curse'), where the suffix '-ly' meant 'in the manner of'.

'cursedly' changed from Middle English adjective/adverb forms such as 'cursidliche' or 'cursedliche' and eventually became the modern English adverb 'cursedly' through regular morphological development (adjective + -ly).

Initially it meant 'in a cursed manner; under a curse', but over time it also acquired a figurative/intensifying sense of 'very' or 'damnably' in some usages.