opaline¹/ʹohpəlien/ adj

opaline²noun

• unmoral
• unmoved
• unmurmuring
• unmuzzle
• unnatural
• unnecessary
• unnerve
• unnumbered
• UNO
• unobserved
• unobtainable
• unobtrusive
• unoccupied
• unofficial
• unorganized
• unorthodox
• unowned
• unpack
• unpaid
• unpaired
• unpalatable
• unparalleled
• unpardonable
• unparliamentary
• unpeg