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

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adj. Not modulated

adj. characterized by lack of variation in pitch, tone, or volume

"There was lots of noise without substance: In popular culture, 2010 was an elephant's call unmodulated, a bleat, a squawk, a low-level blare."

flat    monotonous    monotone    monotonic   

homonuclear    twangy    cargo/troop    good-old-boy    ululant    full-toned    black-velvet    fluty    stoner    PCB