the adverb 'strenuously' is built upon the adjective 'strenuous', which entered english in the late 16th century from latin 'strenuus', signifying brisk, active, or vigorous. the latin term itself may have deeper, more obscure origins, though it is firmly established in classical latin. the addition of the english adverbial suffix '-ly' to the adjective 'strenuous' creates a word that literally means 'in a vigorous manner'. over time, its meaning has specialized to describe actions performed with intense effort or arguments expressed with forceful vigor, carrying forward the core sense of energetic exertion from its latin root.

Structure: strenu (active, vigorous) + ous (adjective suffix) + ly (adverb suffix) strenu is derived from latin 'strenuus', meaning active, vigorous, or brisk. the suffix -ous is from latin '-osus', forming adjectives meaning 'full of' or 'characterized by'. the suffix -ly is from old english '-lice', forming adverbs from adjectives.