la negation "no, not" (see lá); also prefix la- as in lacarë, q.v. (VT45:25)
Quenya
ava-
prefix. negation (refusing or forbidden)
vá-
prefix. negation (refusing or forbidden)
il-
verb. no, *un-
la
no, not
lá
no, not
lá (1) adv. "no, not" (LA, VT45:25) According to VT42:33, lá is the stressed form, alternating with la when the negation is unstressed. In another conceptual phase of Tolkien's, lá had the opposite meaning "yes" (VT42:32-33), but this idea is contradicted by both earlier and later material: usually lá is conceived as a negation. The negation can receive tense markers and be used as a negative verb "when [another] verb is not expressed" (VT49:13), apparently where the phrase "is not" is followed by a noun or an adjective as a predicate, or where some verb is understood, as in English "I do not" (i.e. "I do not do whatever the context indicates"). With pronominal endings la- in the aorist, e.g. lanyë "I do not, am not" (etc.) (Tolkien abandoned the form lamin.) Exemplified in the sentence melin sé apa lanyë hé *"I love him but I do not [love] him" (another person) (VT49:15). Present tense laia, past lánë, perfect alaië, future lauva.
ú-
verb. not-, un-, in-
ú- (2) prefix "not-, un-, in-", denying presence or possession of thing or quality (VT39:14, UGU/UMU/VT46:20, GŪ, LT1:272), or simply suggesting something bad or immoral (see #úcar-, Úmaiar). Tolkien at one point considered redefining ú- as an element signifying "bad, uneasy, hard"; the already-published form únótima would then mean "difficult/impossible to count" rather than simply "uncountable" (VT42:33). However, Tolkien's very last word on the matter seems to be that ú- was to remain a mere negative (VT44:4). Compare úa, q.v. According to the Etymologies, the prefix ú- usually has a "bad sense", whereas according to early material u- (uv-, um-, un-) is a "mere negation" (UGU/UMU vs. VT42:32) According to a later source, ú- could be used as an uninflected verbal prefix, mainly in verse, but in a normal style the prefix was "verbalized" as ua-, q.v. (PE17:144). The stem Ū, as a negation, was accompanied by "pursed lips and shaking of the head" (PE17:145).
ui
no
ui interjection "no" (originally an endingless negative verb in the 3rd person aorist: "it is not [so]"; see #u-). Apparently this is the word for "no" used to deny that something is true (compare vá, which is rather used to reject orders, or to issue negative orders). (VT49:28) Compare uito.
il- (prefix) "no, *un-" (LA); cf. ilfirin "immortal" (vs. firin "dead"). This prefix "denotes the opposite, the reversal, i.e. more than the mere negation" (VT42:32). But il- can also mean "all, every"; see ilaurëa, ilqua, ilquen.