"thick mist" is a correct phrase used in written English.
You can use it when you're trying to describe a fog or haze that is especially dense. Example sentence: The thick mist made it difficult to see more than a few feet in front of her.
The "thick mist" that shrouded her family tree has lifted.
A thick mist rose skyward from the trees, the moisture of night burning off.
Thick mist lay outside, through which the sun appeared as a sickly yellow blur.
These situations include a sea monster, thick mist and a Mary Celeshiptype ship.
The day dawned with thick mist over damp, green hills above Lake Tai.
Thick mist clung to the channel cut through reeds to the lake proper.
Stand on the top of Green Mountain, 2817 feet (858 metres) above sea level, and all you can see is the thick, mist-dampened bamboo that towers above the thin muddy path along the summit ridge.Bamboo is not native to Ascension.
"Yes, we are all lost and wandering in the thick mists.
The constant snow and thick mists made it difficult for Bartlett to calculate the Karluk's position accurately, although during a brief break in the weather on 30 September they glimpsed land which they took to be Cooper Island, in the vicinity of Point Barrow where they had been at the start of August.
I don't stay over, instead driving back down the mountain through the cotton ball-thick mist, being careful not to run over any pythons napping on the road.
Although most of the trees were already stripped bare by the frost, the area's thick rhododendron bushes and dense mist gave the forest a jungle-like feel, abetted by the occasional waterfall and stream.
