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

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n. the perceptual strength or amplitude of sound pressure, measured in sones or phons

n. the physical strength of the sound pressure level, measured in decibels

n. The quality or state of being loud.

n. The state or quality of being loud; great sound or noise; clamor; uproar: as, the loudness of a voice or an instrument.

n. Conspicuousness; flashiness; showiness: as, loudness of dress.

n. tasteless showiness

n. the magnitude of sound (usually in a specified direction)

"In addition, the stress placed at the end of a French sentence is also not a tonic accent -- a rise in loudness -- but a rise in pitch -- which we English speakers do only with questions (unless we are valley girls) -- that is, when asking a question, our voice goes from, say, middle C to F."

tastelessness   

vividness    distinctness    abruptness    timbre    celerity