'astonishingly-exposed' is a compound word formed from 'astonishingly' and 'exposed'. 'Astonishingly' originates from the word 'astonish', which comes from the Old French 'estoner', meaning 'to stun or amaze'. 'Exposed' comes from the Latin 'exponere', meaning 'to put out or set forth'.

'Astonishingly' evolved from the Old French 'estoner', while 'exposed' evolved from the Latin 'exponere'. The combination of these words into 'astonishingly-exposed' is a modern English formation.

Initially, 'astonishingly' meant 'to amaze', and 'exposed' meant 'to put out'. Together, they now convey a sense of being surprisingly open or vulnerable.