Spontaneous spon·ta·ne·ous /spänˈtānēəs/ adjective:
1. done, said, or produced as a result of a sudden impulse, without premeditation or apparent external cause
"Success isn't a result of spontaneous combustion. You must set yourself on fire." Arnold H. Glasow, 1905 – 1998
"Poetry is the spontaneous overflow of powerful feelings: it takes its origin from emotion recollected in tranquility." William Wordsworth, 1770 – 1850 2. (of a person) having an open, natural, and uninhibited disposition "We are born charming, fresh and spontaneous and must be civilized before we are fit to participate in society." Judith Martin, 1938 –