Qenya
sinta-
verb. to fade, *(lit.) become grey
tintina-
verb. to sparkle
vinda-
verb. to fade
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!
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).