instinctual
1. [ adjective ] prompted by instinct
Synonyms: instinctive
Examples:

"an instinctive fear of snakes" "instinctual behavior"

Related terms: natural
Similar spelling:   instinct
  instinctively
  instinctive
  instigant
  instantly
  instructional
  institutional
  instantiate
  instruct
  inaction
  institute
  instigate
  instantiation
  instantaneous