be as clear as mud

To be difficult to see or understand. I guess I need to call a lawyer because these legal contracts are as clear as mud.

(humorous)

to be impossible to understand 'Does that make sense?' 'Yes, it's as clear as mud.'

Name	Pronounced	Usage
Olufunmilayo	o-loo-foo-mee-LIE-o	Western African, Yoruba
Aoibhe	EE-va	Irish
Erdmann	ERD-mahn	German
Kyveli	kee-VEL-ee	Greek
Peni	-	Hawaiian
Kohaku	ko-hah-koo	Japanese