maen (lenited vaen; no distinct pl. form) (skilled) (noun):
Early Quenya
isqalea
adjective. clever
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.
Quenya
finca
clever
finya
adjective. clever
Sindarin
maen
clever
maen
clever
(lenited vaen; no distinct pl. form) (skilled)
finca adj. "clever" (in petty ways) (PE17:119). A distinct form finca is also mentioned as the cognate of Sindarin fineg, but neither form is clearly glossed. The word-group under consideration has to do with hair(PE17:17).