Definition of "fretless" [fretless]

• Describing a stringed instrument that does not have frets. (adjective)

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• "Ronnie taught himself the oud, the 11-string fretless instrument from which the lute, the guitar and other instruments descended."
• "It was by pure accident, it was the first fretless bass ever made."
• "Kmetz is flashier and likes to play fast runs up and down the fretless neck of the shamisen."