Full of life and energy; vigorous: a lively baby. Full of spirit; gay and animated: a lively tune. Marked by animated intelligence: a lively discussion. Invigorating; refreshing. Effervescent; sparkling. Keen; brisk: gave the kitchen floor a lively sweeping. Rebounding readily upon impact; resilient: a lively tennis ball. See Synonyms at active. With energy or vigor; briskly: Step lively!