* Formal: Despite her age, the grandmother remained a vivacious and engaging conversationalist.
* Descriptive: The vibrant colors and lively music created a vivacious atmosphere at the festival.
* Figurative: The vivacious young actress brought a burst of energy to the otherwise somber play.
* Informal: My friend is so vivacious, she lights up every room she walks into.
* Contrasting: Although he was known for his quiet demeanor, he surprised everyone with a vivacious speech at the awards ceremony.