|spänˈtānēəs|

adjective

· performed or occurring as a result of a sudden inner impulse or inclination and without premeditation or external stimulus 

 (of a person) having an open, natural, and uninhibited manner.

·(of a process or event) occurring without apparent external cause 

· archaic (of a plant) growing naturally and without being tended or cultivated

· Biology (of movement or activity in an organism) instinctive or involuntary