This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of, relating to, or prompted by instinct.

adj. Arising from impulse; spontaneous and unthinking: an instinctive mistrust of bureaucrats.

adj. related to or prompted by instinct

adj. driven by impulse, spontaneous and without thinking.

adj. Of or pertaining to instinct; derived from, or prompted by, instinct; of the nature of instinct; determined by natural impulse or propensity; acting or produced without reasoning, deliberation, instruction, or experience; spontaneous.

Prompted by or of the nature of instinct.

adj. unthinking; prompted by (or as if by) instinct

"The actions of man which have been loosely described as instinctive belong for the most part to those classes of actions which we have already shown to be in no proper sense of the word instinctive, that is, those concerned in the appetites and in the functions of organic life."

spontaneous    self-generated   

inherent    spontaneous    automatic    innate    original    voluntary    natural    inborn    intuitive   

distinctive   

innate    intuitive    natural    mutual    profound    irrational    habitual    inward    involuntary    unconscious