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Webster 1913 Edition

Noun.

The condition or quality of being muddy; turbidness; foulness caused by mud, dirt, or sediment;

as, the

muddiness

of a stream

Obscurity or confusion, as in treatment of a subject; intellectual dullness.

Noun.

Turbidness; foulness caused by mud, dirt or sediment; as the muddiness of a stream.

muddiness ‎(usually uncountable, plural muddinesses)

the characteristic of being muddy