instinctive
instinct + -ive
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adjective
relating to or prompted by instinct; apparently unconscious or automatic:
〈人･行動などが〉本能的な, 本能による; 〈感情などが〉本能から来る
e.g. an instinctive distaste for conflict.
(of a person) doing or being a specified thing apparently naturally or automatically:
e.g. an instinctive writer.
USAGE
Instinctive and instinctual both mean ‘relating to or prompted by instinct; unlearned, natural, automatic.’ Instinctual (like processual and other similar formations) is a variant usually found in learned journals of the social sciences.