1. Very good
   - bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, peachy, slap-up, swell, smashing, grouse [Austral, NZ], ripper [Austral]

See also: good

• Sixth Baron Byron of Rochdale
• sixth cranial nerve
• Sixth Crusade
• sixth form
• sixth sense
• sixth-former
• sixthly
• sixties
• sixtieth
• Sixtus IV
• sixty
• sixty-eight
• sixty-fifth
• sixty-five
• sixty-four
• sixty-fourth
• sixty-fourth note
• sixty-nine
• sixty-one
• sixty-seven
• sixty-six
• sixty-three
• sixty-two
• sizable
• sizar