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)
Origin: L. Vivax, -acis, fr. Vivere to live. See Vivid.