Un-less, oni, onid, oddi eithr; os na
Un-like, annhebyg, anghyffelyb
Un-load, dadlwytho
Un-lock, dadgloi, agor clo
Un-loose, gollwng, rhyddhau
Un-pack, dadsypynio
Un-paid, annhaledig, heb ei dalu
Un-roof, didoi, tynu to
Un-root, dadwreiddio, diwreiddio
Un-seen, anweledig, cudd