1. (a.) Rough or rude; unbending; tumultuous; unyielding; strong; powerful.

2. (a.) Exhibiting tumultuous violence and fury; acting with noisy turbulence; violent; rough; stormy.

3. (a.) Noisy; rough; turbulent; as, boisterous mirth; boisterous behavior.

4. (a.) Vehement; excessive.