(no distinct pl. form; coll. pl. thíniath). The form cited in LR:392 s.v. THIN is not marked as containing a long vowel (“thin”).
Noldorin
thîn
noun. evening
thîn
noun. evening
gwîn
noun. evening
Sindarin
thîn
evening
thîn
evening
aduial
noun. the evening, time of star-opening, "evendim"
dû
late evening
(i dhû) (night, nightfall, darkness), pl. dui (i nui) (SD:302).
thinna
grow toward evening
(fade).
tinnu
starlit evening
(i** dinnu, o thinnu) (dusk, twilight, early night without a moon), pl. tinny (i** thynny) if there is a pl. Verb
Quenya
sinyë
evening
sinyë (þ) noun "evening" (THIN)
vinyë
evening
[vinyë noun "evening" (VT46:21)]
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
Qenya
sinye
noun. evening
vinye
noun. evening
Doriathrin
gwine
noun. evening
A noun for “evening” derived from primitive ᴹ✶winyā [winjā], but it was rejected along with its root ᴹ√WIN (Ety/WIN). It is the clearest example of the Ilkorin phonetic development whereby [[ilk|final [j] became [i]]] and then became [e], since Tolkien indicated the intermediate forms before rejecting the word.
Gnomish
mathwen
noun. evening
Middle Primitive Elvish
winyē
noun. evening
†*thîn (no distinct pl. form; coll. pl. thíniath). The form cited in LR:392 s.v. __ is not marked as containing a long vowel (“thin”).