instinctual
adjective
in·stinc·tu·al
in-ˈstiŋ(k)-chə(-wə)l, -ˈstiŋ(k)sh-wəl
: of, relating to, or based on instincts
instinctual behavior
the instinctual society of social insects
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Merriam-Webster unabridged
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