√UG root. “dislike”
In a 1969 essay on negation, Tolkien restored √LA as basis for the “negative of fact”, and altered the meaning of Q. ú to be “bad, uneasy, hard” as a sort of “negative with a bad sense” based on this new root √UG “dislike” (PE22/160). This is similar to the usage of these ú-forms in The Etymologies of the 1930s, where the root ᴹ√GŪ was a negative root, but its derivative ᴹQ. ú- was “not (with evil connotation)” (Ety/GŪ), though in the 1930s it seems to have been a true negative, as opposed to 1969 where it meant “difficult” or “impossible”. See the entry on the Quenya entry negative for a more information on the conceptual development of this and other negative roots.
References ✧ PE22/160; VT43/24