muddy

Concise Oxford English Dictionary © 2008 Oxford University Press:
muddy/ˈmʌdi/

▶adjective (muddier, muddiest)

• 1 covered in or full of mud.

• 2 not bright or clear.

▶verb (muddies, muddying, muddied)

• 1 make muddy.

• 2 make unclear: an attempt to muddy the issue.

– derivatives
muddily adverb,
muddiness noun.