spontaneous

Adjective
  1. Happening or arising without apparent external cause (synset 302290110)
    "spontaneous laughter"; "spontaneous combustion"; "a spontaneous abortion"
    similar to:
    • impulsive, unprompted - proceeding from natural feeling or impulse without external stimulus
    • intuitive - spontaneously derived from or prompted by a natural tendency
    • instinctive, natural - unthinking; prompted by (or as if by) instinct
    same as: self-generated
  2. Said or done without having been planned or written in advance (synset 302221226)
    "he made a few ad-lib remarks"
    similar to: unscripted - not furnished with or using a script
    same as: ad-lib, unwritten

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