arya (1) adj. "excelling", used as the comparative form of mára "good", hence "better" (PE17:57). The superlative ("best") is i arya with the article, with genitive to express *"the best of…" Cf. mára.
Quenya
mára
useful, fit, good
mára
adjective. good, proper, good, proper; [ᴹQ.] useful, fit, good (of things), [ᴱQ.] excellent; mighty, power, doughty
mára
adjective. good
máralë
noun. goodness
mára ná
it is good
mára tyen
good to you, you like
mára tyen
good to you = like
arya
excelling
márië
it is good
márië (2) stative verb "it is good" (FS; from mára "good"; however, the stative-verb suffix -ië is hardly valid in LotR-style Quenya)
márië
goodness
márië (1) "goodness", "good" as noun (abstract formation from the adj. mára). (PE17:58, 89). Genitive máriéno, dative máriena, locative máriessë (PE17:59, occurring in the greeting (hara) máriessë "(stay) in happiness", PE17:162) Allative márienna *"to goodness", used as an interjection "farewell" (archaic namárië, q.v.),
Amarië
good
Amarië fem. name; perhaps derived from mára "good" with prefixing of the stem-vowel and the feminine ending -ië (Silm)
ala-
good
ala- (3), also al-, a prefix expressing "good" or "well" (PE17:146), as in alaquenta (q.v.) Whether Tolkien imagined this ending to coexist with the negative prefix of the same form (#2 above) is unclear and perhaps dubious.
melehta
mighty
melehta adj. "mighty" (PE17:115), cf. meletya
meletya
mighty
#meletya adj. "mighty", isolated from meletyalda adjective with suffix "your mighty" = "your majesty" (see -lda; meletya = *"mighty"). In full Aran Meletyalda "king your mighty" = "your majesty" (WJ:369). Compare melehta.
taura
mighty, masterful
taura adj. "mighty, masterful" (TUR, PE17:115), "very mighty, vast, of unmeasured might or size" (VT39:10). Cf. túrëa.
melehta
adjective. mighty
An adjective for “mighty” derived from the root √MBELEK in a page of notes having to do with “large & small” words, probably from the late 1960s (PE17/115), apparently from the primitive form ✱✶mbelektā (with [kt] > [ht]). A variant form meletya appears with the 2nd-plural possessive suffix -lda as Meletyalda “your mighty” in the Quendi and Eldar essay of 1959-60 (WJ/369), likely from the primitive form ✱✶mbelekya (with [kj] > [tj]). This variant form has a more typical primitive adjective suffix ✶-ya, but is inconsistent with the attested Sindarin cognate S. belaith, so I’d stick with melehta for purposes of Neo-Quenya.
meletya
adjective. mighty
máriën
noun. goodness
mára adj. "useful, fit, good" (of things) (MAG; see MA3; Arct, VT42:34, VT45:30). Nás mara nin "I like it", literally "it is good to me" (VT49:30; read mára for mara?) As the comparative of mára, the unrelated adjective arya "excelling" is used in the sense of "better"; for the superlative *"best", one adds the article: i arya (with genitive to express "the best of…") (PE17:57),