Resembling the sound of a flute; having a clear, high-pitched, melodious quality like a flute's tone.
From flute (Middle English, from Old French flaute, likely from Provençal) + -y (adjectival suffix). The word flute itself may derive from a word meaning to flow, referring to the wind flowing through the instrument.
A fluty voice is often described as ethereal or otherworldly—it's interesting that we borrow instrument names to describe human qualities, showing how music influences how we perceive sound everywhere.
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