1. (n.) The quality or state of being spontaneous, or acting from native feeling, proneness, or temperament, without constraint or external force.

2. (n.) The tendency to undergo change, characteristic of both animal and vegetable organisms, and not restrained or checked by the environment.

3. (n.) The tendency to activity of muscular tissue, including the voluntary muscles, when in a state of healthful vigor and refreshment.

abandon autonomousness autonomy ease extemporaneousness free will gratuitousness indeliberation independence involuntariness naturalness offhandedness self-action self-activity self-determination snap decision snap judgment snapshot spontaneousness uncalculatedness undeliberateness unforcedness unpremeditation unrestraint voluntariness voluntarism voluntaryism volunteer volunteering