<p><strong>Adjective</strong></p><ul><li>coming or resulting from a natural impulse or tendency; without effort or premeditation; natural and unconstrained; unplanned: a spontaneous burst of applause.</li><li>(of a person) given to acting upon sudden impulses.</li><li>(of natural phenomena) arising from internal forces or causes; independent of external agencies; self-acting.</li><li>growing naturally or without cultivation, as plants and fruits; indigenous.</li><li>produced by natural process.</li></ul>