Primitive elvish
gawak
noun. clumsy
Sindarin
gaug
adjective. clumsy; left (hand)
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!
Gnomish
gôg
adjective. clumsy; left (hand)
Early Primitive Elvish
ʒawaka Reconstructed
noun. clumsy
An adjective appearing as G. gôg in the Gnomish Lexicon of the 1910s meaning both “clumsy” and “left (hand)” (GL/40), probably related to ᴱQ. auk “clumsy fellow” and ᴱQ. auqa “awkward, clumsy” (QL/33). It was the opposite of G. fim “clever, right hand” (GL/35).
Neo-Sindarin: For purposes of Neo-Sindarin, I would adapt this word as ᴺS. gaug “clumsy” to have better consistency with the Quenya forms, but I would remove the association with left-handedness, since in Tolkien’s later conception the Elves were ambidextrous and had no association between right/left and good/bad (VT49/6-8).