thick with + substance
Showing dense amounts of something
Use thick with for smoke, dust, fog, vegetation, and similar things.
The room was thick with dust.
Thick with vs. thick of
Thick with is the standard pattern for saying something is full of a substance or object. Thick of is not normally used after thick as an adjective.
Quick answer
Which form is correct?
Use thick with to describe something densely filled or covered. Thick of is generally not a standard adjective pattern, though the fixed phrase in the thick of means in the middle of an activity or situation.
The air was thick with smoke.
The garden was thick with weeds.
They were in the thick of the debate.
The garden was thick with weeds.
They were in the thick of the debate.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
thick with + people/things
Describing crowded conditions
Thick with can describe many people or objects in one place.
The beach was thick with tourists.
in the thick of + activity
Being deeply involved in something
This is a fixed idiomatic phrase, separate from thick with.
She was in the thick of negotiations.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
thick with
The forest was thick with vines.
full of or densely covered by something
thick of
They were in the thick of the battle.
part of the fixed phrase in the thick of, meaning in the middle of something
thick in
The accent was thick in some regions.
used in limited contexts to describe concentration or intensity in a place
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using thick of as a normal adjective pattern
Do not use thick of to mean full of something.
✕ The air was thick of smoke. ✓ The air was thick with smoke.Confusing thick with and in the thick of
These expressions have different meanings and structures.
✕ She was thick with the argument. ✓ She was in the thick of the argument.Leaving out with after thick
The adjective thick usually needs with before the noun causing density.
✕ The soup was thick cream. ✓ The soup was thick with cream.Quick practice
Choose the expression that matches the intended meaning.
1. The sky was thick ___ smoke.
2. He was in the thick ___ the discussion.
3. The field was thick ___ wildflowers.
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Frequently asked questions
Is thick of ever correct?
Only in fixed expressions such as in the thick of something.
Can thick with describe people?
Yes. It can describe crowded places full of people.
What does in the thick of mean?
It means actively involved in the middle of an event or situation.
Related preposition guides
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