Pulsing or throbbing with energy or activity: the vibrant streets of a big city. Vigorous, lively, and vital: "a vibrant group that challenged the . . . system\u201d ( Philip Taubman). Exhibiting or characterized by rapid, rhythmic movement back and forth or to and fro; vibrating. Produced as a result of vibration; resonant or resounding: vibrant voices. Relatively high on the scale of brightness: a vibrant hue.