What is the meaning of Spontaneous?
Self-generated; happening without any apparent external cause.
Done by one's own free choice, or without planning.
Proceeding from natural feeling or native tendency without external or conscious constraint.
Arising from a momentary impulse.
Controlled and directed internally; self-active; spontaneous movement characteristic of living things.
Produced without being planted or without human cultivation or labor.
(Can we verify this sense?) Random.
Sudden, without warning.
Source: wiktionary.orgSearch words containing