Qenya
sinta
adjective. short
sinta-
verb. to fade, *(lit.) become grey
tintina-
verb. to sparkle
vinda-
verb. to fade
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A verb in The Etymologies of the 1930s glossed “fade” derived from the root ᴹ√THIN having to do with grey things (Ety/THIN), so perhaps more literally “✱become grey”.
Conceptual Development: In this same document the root ᴹ√WIN/WIN(I)D “pale blue, blue grey” had a similar verb {vinta- >>} vinda- “fade”, but this root and its derivatives were rejected (Ety/WIN; EtyAC/WIN).