Adjective

(en adjective)

Self-generated; happening without any apparent external cause.

He made a spontaneous offer of help.

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 labor]]; [[endemic, indigenous

a spontaneous growth of wood

Random.

Sudden, without warning.

Adjective

(en adjective)

Happening quickly and with little or no warning.

*, chapter=1

, title= Mr. Pratt's Patients, chapter=1 , passage=I stumbled along through the young pines and huckleberry bushes. Pretty soon I struck into a sort of path that, I cal'lated, might lead to the road I was hunting for. It twisted and turned, and, the first thing I knew, made a sudden bend around a bunch of bayberry scrub and opened out into a big clear space like a lawn.}}

(obsolete) Hastily prepared or employed; quick; rapid.

* Shakespeare

Never was such a sudden scholar made.

* Milton

the apples of Asphaltis, appearing goodly to the sudden eye

(obsolete) Hasty; violent; rash; precipitate.

* Shakespeare

I have no joy of this contract to-night: It is too rash, too unadvised, too sudden