1. Not having a lining or liner
   "a thin unlined jacket" 
2. Smooth, especially of skin
   "his cheeks were unlined"
   - seamless, unseamed

See also: smooth

Antonym: lined

• boom
• boom box
• boom out
• boom town
• boom vang
• boomer
• boomerang
• booming
• boomy
• boon
• boondocks
• boondoggle
• Boone
• boonies
• boor
• boorish
• boorishly
• boorishness
• boost
• boost up
• booster
• booster amplifier
• booster cable
• booster dose
• booster rocket