instinctive

Of, relating to, or prompted by instinct.

Arising from impulse or natural inclination; done without thought or conscious effort; spontaneous.

Being such by natural inclination rather than conscious effort or study.

Prompted by or of the nature of instinct.

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.

related to or prompted by instinct

driven by impulse, spontaneous and without thinking.

unthinking; prompted by (or as if by) instinct