1. Poorly done
   - botchy, unskillful [N. Amer], unskilful [Brit, Cdn] 
2. Accompanied by bloodshed
   - gory, sanguinary, sanguineous, slaughterous

See also: bloody, butcher, unskilled

• op shop
• op-ed
• op. cit.
• opacification
• opacify
• opacity
• opah
• opal
• opal glass
• opalesce
• opalescence
• opalescent
• opaline
• opalise
• opalize
• opaque
• opaque gem
• opaquely
• opaqueness
• OPCW
• ope
• OPEC
• Opel
• open
• open access