turbid [ˈtɜːbɪd] a.
1.) Of liquid: Thick or opaque with suspended matter; not clear; cloudy, muddy. Of air, smoke, clouds, etc.: Thick, dense; dark.
2.) fig. Characterized by or producing confusion or obscurity of thought, feeling, etc.; mentally confused, perplexed, muddled; disturbed, troubled (Oxford English Dictionary 2nd Edition).
Etymology: adaptation of Latin turbidus, full of confusion or disorder; troubled, muddy; perplexed, violent, etc.; from turba, crowd, disturbance.
"Once more you near me wavering apparitions,
That early showed before the turbid gaze.
Will I now seek to grant you definition,
My heart essay again the former daze?"
(Faust by Johann Wolfgang von Goethe, Walter Arndt (trans.), 1976).