1. Tested and proved to be reliable
   - tested, tried, tried and true

See also: dependable, reliable

• Sium
• Sium latifolium
• Sium sisarum
• Sium suave
• Siva
• Sivaism
• Sivan
• Sivapithecus
• Siwan
• six
• Six Nations
• six times
• Six-Day War
• six-footer
• six-gilled shark
• six-gun
• six-lined racerunner
• six-membered
• six-pointed
• six-shooter
• six-sided
• six-spot
• sixer
• sixfold
• sixpack