chissà
who knows
adverb kees-SAH Less Common
Origin: Contracted from chi sa (who knows)
Also means
maybe
Usage Note
Chissà is an invariable exclamatory adverb expressing uncertainty or wistful speculation — 'who knows,' 'I wonder,' or 'maybe.' It often opens a sentence (Chissà dove sono andati = Who knows where they went) and can stand alone as a one-word reply. Never written as two words.
Examples
"Chissà se tornerà domani."
Natural Translation
Who knows if he'll come back tomorrow.

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