mindmap root((自动)) spontaneous implies lack of prompting and connotes naturalness: a ~ burst of applause. impulsive implies acting under stress of emotion orthe spirit of the moment, seemingly without thought or volition: ~ act of violence. instinctive stresses spontaneous action involving neither judgment nor will: blinking is an ~ reaction. automatic implies prompt action engaging neither the mind nor the emotions and connotes a predictable and unvarying response: his denial was ~. mechanical stresses the lifeless, often perfunctory character of the response: over the years, her style of teaching became ~.