instinctual

adjective
in·​stinc·​tu·​al | \in-ˈstiŋ(k)-chə(-wə)l, -ˈstiŋ(k)sh-wəl \

Medical Definition of instinctual 

: of, relating to, or based on instincts instinctual behavior the instinctual society of social insects

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