instinctive

an instinctive reaction

an instinctive distaste for conflict.

an instinctive mistrust of bureaucrats.

visceral needs.See Synonyms at instinctive

an instinctive fear of snakes;

her own instinctive, uninstructed response.

He tried to conceal his instinctive revulsion at the idea.

Offering to help the accident victims seems as instinctive as breathing.

Lorenz studied instinctive behavior in animals, especially in greylag geese and jackdaws.

Soames checked his instinctive "Not particular"--he would not chaffer with this alien.