The difference between On the qui vive and Vigilant
On the qui vive is also adverb with the meaning: in a state of heightened vigilance, especially prior to battle.
Vigilant is also adjective with the meaning: watchful, especially for danger or disorder.
check bellow for the other definitions of On the qui vive and Vigilant
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On the qui vive as an adverb:
in a state of heightened vigilance, especially prior to battle
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Vigilant as an adjective:
Watchful, especially for danger or disorder; alert; wary
Examples:
"Be vigilant for signs of disease in your garden."