(1):

(a.) Rough or rude; unbending; 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.