of, pertaining to, or of the nature of instinct.
prompted by or resulting from or as if from instinct; natural; unlearned: an instinctive will to survive.
Also, instinctual [in-stingk-choo-uhl] .

1640–50; instinct1 + -ive

instinctively, instinctually, adverb
half-instinctive, adjective
half-instinctively, adverb
noninstinctive, adjective
noninstinctively, adverb
noninstinctual, adjective
noninstinctually, adverb
semi-instinctive, adjective
semi-instinctively, adverb
uninstinctive, adjective
uninstinctively, adverb
uninstinctiveness, noun

2. spontaneous, intuitive, unpremeditated. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To instinctual
World English Dictionary
instinctive or instinctual (ɪnˈstɪŋktɪv)
1.  of, relating to, or resulting from instinct
2.  conditioned so as to appear innate: an instinctive movement in driving
instinctual or instinctual
in'stinctively or instinctual
in'stinctually or instinctual

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It is normal for me to live with people who speak a different language than me,
  this is a more instinctual way of living.
Nevertheless, snakes produce one of the strongest instinctual fear responses.
As you might expect, horses are unexceptional learners, relying heavily on
  instinctual responses.
In a startling way she succeeds--not by opposing her instinctual cynicism but
  by accepting it.
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