IPA: /ʌnˈlaɪnd/
KK: /ʌnˈlaɪnd/
Not having any lines or markings, especially referring to surfaces or materials that are smooth and plain.
The artist chose an unlined canvas for her painting to create a more natural look.
Unlined → It is formed from "un-" (meaning not) and "lined" (from Old English "linian", meaning to line or cover). The word "unlined" means not having a lining or covering.
Think of 'not' ('un-') having a 'covering' ('lined') — that's why unlined means something that does not have a lining.