1. Having nothing extraneous
   "the unlittered shoulders of the road"
   - uncluttered

See also: tidy

• organoleptic
• organon
• organophosphate
• organophosphate nerve agent
• organs
• organum
• organza
• organzine
• orgasm
• orgasmic
• orgiastic
• orgy
• oribi
• orichalc
• orichalcum
• oriel
• oriel window
• orient
• oriental
• oriental alabaster
• Oriental arborvitae
• Oriental beetle
• oriental bittersweet
• Oriental black mushroom
• oriental bush cherry