'externally-motivated' originates from the combination of 'external' and 'motivate,' where 'external' comes from Latin 'externus' meaning 'outside,' and 'motivate' is derived from Latin 'motivus' meaning 'causing motion.'

'externus' transformed into the Old French word 'externe,' and eventually became the modern English word 'external.' Similarly, 'motivus' evolved into the French word 'motiver,' leading to the modern English 'motivate.'

Initially, 'external' meant 'outside' and 'motivate' meant 'to cause motion,' but over time, they combined to describe being driven by outside factors.