'deeply-verified' originates from the combination of 'deeply' and 'verify', where 'deeply' means 'to a great depth' and 'verify' means 'to confirm the truth or accuracy of something'.

'verify' changed from the Old French word 'verifier' and eventually became the modern English word 'verify'.

Initially, 'verify' meant 'to confirm the truth', and this meaning has largely remained the same in modern usage.