'greatly-changed' originates from the combination of 'greatly,' meaning 'to a large extent,' and 'changed,' the past participle of 'change,' meaning 'to make or become different.'

'greatly' comes from Old English 'grēatlic,' meaning 'large or important,' and 'changed' from Old French 'changier,' meaning 'to alter or exchange.'

Initially, 'greatly' meant 'large or important,' and 'changed' meant 'to alter.' Together, they evolved to mean 'significantly altered.'