'astonishingly-broadened' is a compound word formed from 'astonishingly' and 'broadened'. 'Astonishingly' originates from 'astonish', which comes from the Old French 'estoner', meaning 'to stun or amaze'. 'Broadened' is the past participle of 'broaden', which comes from the Old English 'brādian', meaning 'to make broad'.

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

Initially, 'astonish' meant 'to stun or amaze', and 'broaden' meant 'to make broad'. The combination 'astonishingly-broadened' retains these meanings, emphasizing the surprising nature of the broadening.