Extremely surprising or shocking; amazing or astonishing in a way that leaves someone stunned.
From Old French 'astoner,' meaning 'to stun.' The prefix 'a-' intensifies 'stound' (an archaic word for a short time or a sharp pain), suggesting something that stuns you in a moment.
The word 'astound' comes from an old meaning of 'stound' as a moment of sharp pain or shock—so 'astounding' literally means something that shocks you like a sudden pain!
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