Harvey took an instinctive dislike to Percy when they met.
Advanced English Dictionary
+adjective based on instinct, not thought or training: instinctive knowledge + She's an instinctive player. + My instinctive reaction was to deny everything. instinctively adverb: He knew instinctively that something was wrong.
Collocation Dictionary adj
be, seem | become
totally | purely
My reaction was purely instinctive.
Random quote: The possession of knowledge does not kill the sense of wonder and mystery. There is always more mystery.: Anais Nin