the word 'studious' entered english in the late 14th century from latin 'studiosus', meaning "zealous, diligent, eager," which itself derives from 'studium' (zeal, eagerness, study). the latin 'studium' is thought to originate from the proto-indo-european root (s)teu- meaning "to push, strike, knock," which evolved into the sense of mental application or eagerness. the literal meaning "full of study or zeal" has been retained in modern english, describing someone characterized by diligent application to learning or a task performed with careful attention.

Structure: studi (study) + ous (adjective suffix) studi: from latin 'studium' (zeal, study, application). ous: from latin '-osus', an adjective-forming suffix meaning "full of, characterized by".