'overanalyze' originates from English, specifically formed from the prefix 'over-' + the verb 'analyze', where 'over-' meant 'excessively' and 'analyze' meant 'to examine in detail'.

'analyze' comes from Greek 'analusis' (ἀνάλυσις) via Late Latin and Old French (e.g. 'analyser'), then entered English as 'analyse/analyze'; the modern compound 'overanalyze' formed in English by adding 'over-' to that verb.

Initially, the root meant 'a breaking up' or 'separation into parts' (Greek), and over time the sense evolved into the modern meaning 'to examine or study in detail'; the prefix 'over-' later added the sense of 'excessive' to produce 'overanalyze'.