ala, #ála (1) imperative particle á, a combined with the negation lá, -la "not" to express a prohibition (VT43:22; see lá #1). Also with 1st person suffix -lyë (alalyë and álalyë, VT43:10, 22, VT44:8) and 1st person pl. object suffix -më (alamë and álamë, "do not [do something to] us", as in álamë tulya, "do not lead us", VT43:12, 22). In the essay Quendi and Eldar, negative imperatives are rather indicated by áva, q.v., but this form can well coexist with ala, #ála.
ala- (2) negative prefix "not", "un-", reduced to al- before a vowel (VT42:33, GALA, VT45:25), though the example Alcorin would suggest that al- can sometimes appear before a consonant as well. In a deleted entry in Etym, al(a)- was defined as "not" and said to be a "pure negative" (VT45:5). In alahasta, Alamanyar, alasaila, Alcorin.
verb. no, *un-
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.
la negation "no, not" (see lá); also prefix la- as in lacarë, q.v. (VT45:25)
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.
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.