The definition of 'spontaneous' & the word 'spontaneous' in example sentences or phrases

Adjective
1
happening or arising without apparent external cause
  1. spontaneous laughter
  2. spontaneous combustion
  3. a spontaneous abortion
2
said or done without having been planned or written in advance
3
produced without being planted or without human labor
Adjective satellite
1
said or done without having been planned or written in advance
  1. he made a few ad-lib remarks

Synonyms of the word 'spontaneous' & Antonyms of the word 'spontaneous'.

Adjective
Synonymsself-generated, ad-lib, unwritten, wild,
Antonymsinduced,
Adjective satellite
Synonymsad-lib, unwritten,