1. By bad luck
   - unfortunately, unluckily, alas

See also: regrettable

• rotl
• rotogravure
• rotor
• rotor blade
• rotor coil
• rotor head
• rotor shaft
• rotoscope
• rotovator
• rotted
• rotten
• rotten borough
• rottenly
• rottenness
• rottenstone
• rotter
• Rotterdam
• rotting
• Rottweiler
• rotund
• rotunda
• rotundity
• rotundly
• rotundness
• roturier