'roguishly' originates from English, specifically from the adjective 'roguish' plus the adverbial suffix '-ly', where 'roguish' comes from the noun 'rogue' meaning 'dishonest or playfully bad person' and the suffix '-ish' means 'having the quality of'.

'roguishly' changed from the noun 'rogue' to the adjective 'roguish' (rogue + -ish) and eventually became the adverb 'roguishly' by adding '-ly'.

Initially it meant 'in the manner of a rogue' (i.e., like a dishonest or vagabond person), but over time it acquired the additional sense of 'playfully mischievous' while retaining the sense of sly or dishonest behavior in some contexts.