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 instinctively
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
Most persons who have known and liked horses, instinctively say the horse who,
  and the horse he or she.
They instinctively put on different faces, clothes or voices as the situation
We instinctively know to wait for a table, sit down, look at the menu and then
  order our food.
If you keep your gaze fixed, others will instinctively get out of the way.
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