full of or characterized by vigor

a vigorous effort.

strong; active; robust

a vigorous youngster.

energetic; forceful

vigorous steps; a vigorous personality.

powerful in action or effect

vigorous law enforcement.

growing well, as a plant.

adjective

enervated , idle , impotent , inactive , lethargic , weak

adjective

active , athletic , ball of fire , bouncing , brisk , dashing , driving , dynamic , effective , efficient , enterprising , exuberant , flourishing , forceful , forcible , hale , hard-driving , hardy , healthy , hearty , intense , lively , lusty , mettlesome , peppy , persuasive , potent , red-blooded * , robust , rugged , snappy , sound , spanking , spirited , steamroller , strapping , strenuous , strong , strong as an ox , sturdy , take-charge , take-over , tough , vital , zealous , zippy *notes:rigorous means demanding strict attention to rules and procedures; vigorous means strong and active physically or mentally , dynamical , kinetic , sprightly , able-bodied , iron , red-blooded , energetic , spry , zippy , hard-hitting , powerful , cogent , eager , efficacious , luxuriant , muscular , stout , vibrant