Instinctive(a.) 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.
Thesaurus Entries
animal, animalian, animalic, animalistic, atavistic, automatic, beastlike, beastly, bestial, blind, bodily, born, brutal, brute, brutelike, brutish, coeval, compulsive, conditioned, congenital, connatal, connate, connatural, constitutional, dumb, forced, genetic, gut, hereditary, immediate, impulsive, in the blood, inborn, inbred, incarnate, indigenous, ingrained, inherent, inherited, innate, instinctual, intestinal, intrinsic, intuitional, intuitive, involuntary, irrational, libidinal, mechanical, mindless, native, native to, natural, natural to, nonrational, normal, organic, physical, primal, reflex, reflexive, regular, spontaneous, subconscious, subhuman, subliminal, temperamental, typical, unconscious, unintentional, unlearned, unmeditated, unpremeditated, unprompted, unthinking, unwilled, unwilling, unwitting, visceral, zoic, zooidal, zoologic