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Adjective spontaneous has 3 senses
spontaneous, self-generated - happening or arising without apparent external cause; "spontaneous laughter"; "spontaneous combustion"; "a spontaneous abortion"Antonyms:  induced, elicited, evoked, iatrogenic
 
ad-lib, spontaneous, unwritten - said or done without having been planned or written in advance; "he made a few ad-lib remarks"Antonyms:  scripted, written (indirect, via unscripted)
 
wild, spontaneous - produced without being planted or without human labor; "wild strawberries"Antonym:  planted (indirect, via unplanted)
 
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