كَيْسَ prudent in Arabic
كَيْسَ is how you say “prudent” in Arabic.
Arabic
English
The audio uses AI voices.
Example sentence
فَإِذَا قَدَمْتَ فَالْكَيْسَ الْكَيْسَ
So when you arrive, be especially prudent.
فَالْكَيْسَ so the prudent
Here fa- introduces the response to the condition ('then'), and it leads a definite noun carrying al- ('the'). This first appearance of the word sets up the doubled, emphatic command for prudence that the repetition then drives home.
The English is machine-translated.

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More example sentences
فَإِذَا قَدَمْتَ فَالْكَيْسَ الْكَيْسَ
So when you arrive, be especially prudent.
الْكَيْسَ the prudent
This repeats the previous word, and the doubling is itself the grammar: in Arabic, saying a word twice like this is a way to issue an urgent command or strong emphasis, here meaning 'be very prudent'. The accusative ending fits its role as an implied 'take to ___' object.