Energetic (8)
'energetic' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for vibrant that I've seen before include "Strong and vivid" , "Lively; pulsating" , "Vivacious" , "Brightly-coloured" , "Dynamic" .)
(Other definitions for dynamic that I've seen before include "Having power" , "Very active" , "Driving" , "Energetic, with great force of character" , "High-powered" .)
'energetic' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for vigorous that I've seen before include "energetic,strenuous" , "Strong, healthy" , "Full of energy and strength" , "Strong and energetic" , "Powerful, energetic" .)