1. Having vigorous powers of life; tenacious of life; long-lived. Hitherto the english bishops have been vivacious almost to wonder. . . . But five died for the first twenty years of her Queen Elizabeth’s reign. (Fuller) The faith of christianity is far more vivacious than any mere ravishment of the imagination can ever be. (I. Taylor)
2. Sprightly in temper or conduct; lively; merry; as, a vivacious poet. Vivacious nonsense.
3. (Science: botany) Living through the winter, or from year to year; perennial.
Synonym: Sprightly, active, animated, sportive, gay, merry, jocund, light-hearted.
Origin: L. Vivax, -acis, fr. Vivere to live. See Vivid.