Gnomish
laith
noun. time, the course of time; (properly) lapse
laith(r)a-
verb. to let slip, lose, mislay, forget; (intr.) to be lost
aluin
masculine name. Time
lûm
noun. time
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 appearing as G. laitha- or laithra- “let slip, lose, mislay, forget” from the Gnomish Lexicon; it could also be used intransitively to mean “to be lost”, especially in the form laithra- (GL/52). Tolkien said it was the result of a mingling of two roots: ᴱ√lech and ᴱ√lith-, the former having to do with slippery things and the latter with time.
Neo-Sindarin: In 2018 I made an attempt to salvage this verb (my suggestion was ᴺS. laetha-), but this was rejected by the community. In a Discord conversation in 2022-04-16, Elaran proposed redefining this verb as lítha- “to let slip, lose, mislay; (intr.) to be lost” based on the later root √LIK “slip” which was recently published; by extension it can also mean “to forget”. I quickly adopted Elaran’s proposal as better than mine.