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spontaneous

• (a) happening or arising without apparent external cause
  • spontaneous laughter
  • spontaneous combustion
  • a spontaneous abortion
  self-generated,
• (s) said or done without having been planned or written in advance
  • he made a few ad-lib remarks
  ad-lib, unwritten,

Synonyms

self-generated ad-lib unwritten

Antonyms

induced

Words of close approximity