'astonishingly-proven' is a compound word formed from 'astonishingly' and 'proven'. 'Astonishingly' originates from the word 'astonish', which comes from the Old French 'estoner', meaning 'to stun or amaze'. 'Proven' is the past participle of 'prove', which comes from the Latin 'probare', meaning 'to test or approve'.

'Astonishingly' evolved from the Middle English 'astonisshen', while 'proven' evolved from the Old English 'prōfian'.

Initially, 'astonishingly' meant 'to stun or amaze', and 'proven' meant 'tested or approved'. Together, they convey the idea of something being confirmed in a surprising manner.