'resource' originates from Old French 'resourse', which meant 'a source or supply'. 'Intensive' comes from Latin 'intensivus', meaning 'stretched or strained'.

'Resource' evolved from the Old French 'resourse' and 'intensive' from Latin 'intensivus', eventually forming the modern English term 'resource-intensive'.

Initially, 'resource' referred to a source of supply, and 'intensive' meant stretched or strained. Together, they now describe something that requires a lot of resources.