Source : Webster's Revised Unabridged Dictionary (1913)

Boistous \Bois"tous\, a.
   Rough or rude; coarse; strong; violent; boisterous; noisy.
   [Obs.] --Chaucer. -- {Bois"tous*ly}, adv. --
   {Bois"tous*ness}, n. [Obs.] --Chaucer.