'attitudinize' originates from English, formed from the noun 'attitude' + the verbal suffix '-ize' (ultimately from Greek '-izein' via Latin/French), where 'attitude' came into English from Italian 'attitudine'.

'attitude' came into English via Italian 'attitudine' (from Latin 'aptitudo' meaning 'fitness, suitability'); English later formed the verb 'attitudinize' by adding '-ize' to create a verb meaning 'to take on an attitude'.

Initially related to 'attitude' meaning 'posture or position' (often physical or mental stance); over time 'attitudinize' came to mean specifically 'assume an affected or posed attitude' (often for impression rather than sincerity).