BOIS'TEROUS, adjective 1. Loud; roaring; violent; stormy; as a boisterous wind. 2. Turbulent; furious; tumultuous; noisy; as a boisterous man. 3. Large; unwieldy; huge; clumsily violent; as a boisterous club. 4. Violent; as a boisterous heat.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI