A word appearing as G. mabwed “handed, having hands. dexterous” in the Gnomish Lexicon of the 1910s, an adjectival form of G. mab “hand(s)” (GL/55). It also appeared with a vocalic augment: G. amabwed “having hands” (GL/19). This augmented form amabwed reappeared in the Gnomish Lexicon Slips modifying that document (PE13/109).
Neo-Sindarin: For purposes of Neo-Sindarin, I would adapted this word as ᴺS. mabren using a later adjectival suffix: -ren.
maitë (stem *maiti-, given the primitive form ¤ma3iti) adj. "handed" or "handy, skillful" (VT49:32, 42) in Angamaitë, hyarmaitë, lungumaitë, morimaitë, Telemmaitë, q.v. Etym gives maitë pl. maisi "handy, skilled" (MA3), but Tolkien later eliminated the variation t/s (compare ataformaitë "ambidextrous", pl. ataformaiti).