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Instinctive (adjective)
Related to or prompted by instinct.
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Instinctive (adjective)
Driven by impulse, spontaneous and without thinking.
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Instinctual (adjective)
Of, relating to, or derived from instinct.
Wiktionary
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Instinctive (adjective)
relating to or prompted by instinct; done without conscious thought
“an instinctive distaste for conflict”
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Instinctive (adjective)
(of a person) doing or being a specified thing apparently naturally or automatically
“he was an instinctive cook”
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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