instinctive
/in-ˈstiŋ(k)-tiv/
adjective
of, relating to, or being instinct
prompted by natural instinct or propensity : arising, spontaneously
spontaneous impulsive instinctive automatic mechanical mean acting or activated without deliberation. spontaneous implies lack of prompting and connotes naturalness. impulsive implies acting under stress of emotion or spirit of the moment.