muddied

Made dirty with mud.

Made unclear, obfuscated (generally as part of the phrase muddied the water)

“He muddied the situation until they acquitted in confusion.”

Made muted of color.

“The addition of the second batch of paint muddied the bright colors to a dull and washed look.”

To get mud on (something).

“If you muddy your shoes don't wear them inside.”

To make a mess of, or create confusion with regard to; to muddle.

“The discussion only muddied their understanding of the subject.”