1. Subject to accident or chance or change
   - chancy, fluky, iffy

See also: fluke, uncertain

• oilseed rape
• oilskin
• oilstone
• oilstove
• oily
• oink
• ointment
• Oireachtas
• OIS
• Ojibwa
• Ojibway
• Ojos del Salado
• ok
• oka
• okapi
• Okapia
• Okapia johnstoni
• okay
• Okeechobee
• Okeechobee Waterway
• Okefenokee Swamp
• okeh
• Oken
• Okenfuss
• okey