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 instinctive
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 has also little control over its body, and all its movements are automatic or instinctive.
Instinctive behavior is an unlearned, inborn tendency to behave in a way characteristic of a species, ie migration.
The instinctive reaction is to put in a coin and wait for the head and arms to
  start moving.
They then conducted a series of experiments on instinctive and learned fear.
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