crossly

The adverb 'crossly' is formed from the adjective 'cross', which itself evolved from the noun 'cross'. The noun entered English from Old Irish 'cros', borrowed from Latin 'crux', referring to the instrument of torture and execution. By the 16th century, the adjective 'cross' had developed the figurative sense of "contrary, adverse, opposing", much like two lines intersecting in conflict. This notion of opposition naturally extended to human temperament, giving rise to the meaning "ill-tempered, annoyed". The suffix '-ly', of Germanic origin, is then added to form the adverb, describing the manner of being annoyed or irritable.

Structure: cross (angry) + ly (adverb-forming suffix) - cross: From Old English 'cros' (noun), ultimately from Latin 'crux, crucis'. In this adjectival/adverbial sense, it functions as a base meaning "angry, ill-tempered". - ly: From Old English '-līc', an adverbial suffix meaning "in a specified manner".