Volatile. Light-hearted, airy; changeable, fickle; lively, evaporating, vaporable, vivacious, buoyant, jocund; inconstant, flighty, whimsical, capricious, unsteady, reckless.
Ant. Fixed, steady, established, determined, solid, settled; persistent, resolute; involatile; somber, demure.
Volition. Will, choice, preference, determination, purpose; discretion, free will, election, deliberation.
Ant. Necessity, force, predestination, fate, coercion, foreordination.
Voluble. Rotating; nimble, glib; active; fluent, loquacious, talkative, rapid, running, coursing.
Ant. Direct; slow, deliberate, hesitating, stuttering, torpid, stammering, creeping, lazy.
Volume. Book, tome; convolution, coil; dimension, mass, capacity, bulk, size.
Ant. Minuteness, smallness.
Voluntary. Spontaneous, willing, uncompelled; free, impulsive; unconstrained, deliberate, intentional, optional, gratuitous, by choice; discretional.
Ant. Coerced, forced, involuntary, compulsory, necessitated, constrained.