Boisterous \Bois"ter*ous\, a. [OE. boistous; of uncertain origin; cf. W. bwyst wild, savage, wildness, ferocity, bwystus ferocious.]

1. Rough or rude; unbending; unyielding; strong; powerful. [Obs.]

``Boisterous sword.'' ``Boisterous hand.'' --Shak.

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

The waters swell before a boisterous storm. --Shak.

The brute and boisterous force of violent men. --Milton.

3. Noisy; rough; turbulent; as, boisterous mirth; boisterous behavior.

I like not that loud, boisterous man. --Addison.

4. Vehement; excessive. [R.]

The heat becomes too powerful and boisterous for them. --Woodward.

Syn: Loud; roaring; violent; stormy; turbulent; furious; tumultuous; noisy; impetuous; vehement.

Source: Webster's Revised Unabridged Dictionary (1913)