SPONTANEOUS

adjective Etymology: Late Latin spontaneus, from Latin sponte of one's free will, voluntarily Date: 1653 proceeding from natural feeling or native tendency without external constraint, arising from a momentary impulse, controlled and directed internally ; self-acting , produced without being planted or without human labor ; indigenous , developing or occurring without apparent external influence, force, cause, or treatment, not apparently contrived or manipulated ; natural , ~ly adverb ~ness noun Synonyms: see: ~