WordWeb Online

1. Characteristic of an enemy or one eager to fight
   "badass acts against another country";
   - aggressive, belligerent, chippy [N. Amer]
    
2. Annoyed and irritable
   - crabbed, crabby, cross, fussy, grouchy, grumpy, bad-tempered, ill-tempered, arsey [Brit]
    
3. (informal) brilliant; very good
   - storming [Brit], blinding [Brit], stonking [Brit], brill [Brit], wicked, ace, def, magic [Brit], smokin', smoking, super, sick [N. Amer]

1. Someone who is aggressive, belligerent or bad-tempered

Derived forms: badasses

See also: awesome [informal], beaut [Austral, NZ], excellent, fantabulous, first-class, hostile, ill-natured, splendid, top-drawer

Encyclopedia: Badass