(especially of a woman)having a lively, attractive personalityHe had three pretty, vivacious daughters.She appeared to be her old, vivacious self again.Oxford Collocations DictionaryVivacious is used with these nouns: personalitySeefull entrySee related entries:EnergeticWord Originmid 17th cent.: from Latin vivax, vivac- ‘lively, vigorous’ (from vivere ‘to live’) + -ious.
See vivacious in the Oxford Advanced American Dictionary