This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. without lining; without liner

adj. unmarked by lines, especially of the skin

adj. not having a lining or liner

adj. smooth, especially of skin

"His cheeks are full and his skin unlined; he looks far younger than his 67 years."

smooth   

marked    dashed    lined   

seamless    smooth    unmarked    unmarred   

affined    aligned    assigned    behind    bind    blind    combined    confined    consigned    declined   

unwrinkled    untanned    hairless    unscarred    dome-like    unsurprised    unremarkable    well-formed    unembarrassed    sun-browned