This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Deficient in melody; not tuneful.

adj. Producing no music; silent.

adj. Having no pleasing tune; not tuneful.

adj. Silent or mute.

adj. Without tune; inharmonious; unmusical.

adj. Not employed in making music.

adj. Not expressed in music or poetry; unsung.

Unmusical; inharmonious.

Not employed in or not capable of making music.

Not expressed rhythmically or musically; silent; without voice or utterance.

adj. not having a musical sound or pleasing tune

"Once the show actually begins, it's obvious that writers Craig Christie and Andrew Patterson have done their homework - with the likes of Sweden represented by a perky Abba-style quartet, the UK by a couple of chavvy singers with a pointless ballad, Iceland by a Bjork-alike singing a tuneless, meaningless song."

inharmonious    unmusical    unsung   

off-key    atonal    low-pitched    plaintive    tuneful