1. Lacking official approval
   - unaccredited, unlicensed

See also: unauthorised [Brit], unauthorized

• sonic boom
• sonic delay line
• sonic depth finder
• sonnet
• sonneteer
• sonny
• sonny boy
• Sonny Liston
• sonobuoy
• sonogram
• sonograph
• sonography
• sonometer
• Sonora
• Sonora gum
• Sonora lac
• Sonora semiannulata
• Sonoran Desert
• Sonoran lyre snake
• Sonoran whipsnake
• sonorant
• sonority
• sonorous
• sonorously
• sonorousness