Instinctive (adjective)
Related to or prompted by instinct.
Instinctive (adjective)
Driven by impulse, spontaneous and without thinking.
Instinctual (adjective)
Of, relating to, or derived from instinct.
Wiktionary
Instinctive (adjective)
relating to or prompted by instinct; done without conscious thought
“an instinctive distaste for conflict”
Instinctive (adjective)
(of a person) doing or being a specified thing apparently naturally or automatically
“he was an instinctive cook”
Instinctual (adjective)
relating to or denoting an innate, typically fixed pattern of behaviour; based on instinct
“an instinctual survival response”
“instinctual maternal behaviour”
Oxford Dictionary