Quenya 

curo

skillful [?device - tolkien's handwriting was illegible]

curo (curu-) noun "a skillful [?device - Tolkien's handwriting was illegible]". (VT41:10)

curo

noun. skillful (?device)

A derivative of √KUR “skill” in notes from the late 1960s with a difficult-to-read gloss, apparently “a skilful (?device)” according to Carl Hostetter (VT41/10).