adjective
acting or activated without apparent thought or deliberation
a spontaneous burst of applause
Synonyms: automatic, impulsive, instinctive, involuntary, unmeditated, unpremeditated, unprompted, will-less
Related Word: unconstrained, unforced; unreasoned, unstudied; extemporaneous, extempore, impromptu, improvised, offhand; natural, simple, unsophisticated
Contrasted words: deliberate, intended, intentional, planned, predetermined, preplanned, studied, thought-out, voluntary, willed, willful; forced, prompted; conventional, formal, stylized
Antonyms: premeditated