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.

Random.

Sudden, without warning. +