spontaneously
/spän-ˈtā-nē-əs/
adjective
proceeding from natural feeling or native tendency without external constraint
arising from a momentary impulse
controlled and directed internally : self-acting
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.