Happening or arising without apparent external cause
English: spontaneous, self-generated
spontanBahasa Indonesia
spontaneous, ad-lib, self-generated, unwritten
Less common
#6,609 of the corpus · 12 per million words · 51,401 occurrences
Adjective
Said or done without having been planned or written in advance
English: ad-lib, spontaneous, unwritten
Less certain link between this word and this sense.