Vivacious
means "full of life," it can be traced back to the Latin verb
"vivere," meaning "to live." The word was created around
the mid-17th century using the Latin adjective "vivax," meaning
"long-lived, vigorous, or high-spirited." Other descendants of
"vivere" in English include "survive," "revive,"
and "victual"—all of which came to life during the 15th century—and
"vivid" and "convivial," both of which surfaced around the
same time as "vivacious." Somewhat surprisingly, the word
"live" is not related; it comes to us from the Old English word
"libban."