(comparative more roisterous, superlative most roisterous)
- Loud and disorderly; carousing
- The New Year's Eve crowd was wild and roisterous.
roister + -ous
Variant of roister
- to boast or swagger
- to be lively and noisy; revel boisterously
Origin of roister; from earlier roister (n.), loud bully ; from Old French ruistre ; from Classical Latin rusticus: see rustic