How to say “Unbelievable!” in Greek

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Απίστευτο! a-PEE-stef-to

Unbelievable!

“Απίστευτο! Δεν το περίμενα.”

Unbelievable! I didn't expect that.

This word doesn't change form the way verbs, nouns, and adjectives do — what you see above is its only form.