Stimulating or invigorating.
Full of liveliness and activity; characterized by quickness of motion or action.
Full of spirit of life; effervescing.
Abrupt, curt in one's manner or in relation to others.
To make or become lively; to enliven; to animate.
That operates to produce an effect.
Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.
An operative person or thing.