solid at + activity
Talking about skill or performance
Solid at means competent or reliable in an activity.
He is solid at public speaking.
solid with, in, at, for or on?
Solid commonly combines with different prepositions depending on meaning. Some combinations describe skill, support, or physical stability.
Quick answer
Most common uses of solid
Use solid at for skill, solid with for reliable support or relationships, and solid in for strength within an area or structure. Solid on is used for stable physical contact or knowledge of a topic. Solid for is less common and usually means suitable for a purpose.
She is solid at maths.
They have been solid with their clients.
The company is solid in the European market.
They have been solid with their clients.
The company is solid in the European market.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
solid with + person/group
Talking about dependable relationships
Solid with describes loyal, supportive, or reliable behaviour toward people.
She has always been solid with her teammates.
solid in + area/field
Talking about strength within an area
Solid in refers to strong performance or stability in a field, market, or structure.
The brand remains solid in Asia.
solid on + surface/topic
Talking about stable contact or knowledge
Solid on can describe physical position or confidence about a topic.
The ladder stood solid on the ground.
She is solid on the legal details.
solid for + purpose
Talking about suitability
Solid for means suitable or dependable for a particular use.
This laptop is solid for office work.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
solid at
He is solid at coding.
competent in an activity
solid with
She has been solid with her friends.
loyal or dependable toward people
solid in
The firm is solid in the local market.
strong within an area or field
solid on
I am solid on the main facts.
confident or well informed about something
solid for
This option is solid for beginners.
suitable or reliable for a purpose
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using solid for skill
Use solid at for ability, not solid in most activity contexts.
✕ She is solid in tennis. ✓ She is solid at tennis.Confusing solid with and solid to
Use solid with for supportive behaviour toward people.
✕ He was solid to his colleagues. ✓ He was solid with his colleagues.Using solid on for people
Solid on usually refers to topics or surfaces, not relationships.
✕ She is solid on her team. ✓ She is solid with her team.Overusing solid for
Solid for is possible for suitability but not usually for ability.
✕ He is solid for accounting. ✓ He is solid at accounting.Quick practice
Choose the expression that matches the intended meaning.
1. She is very ___ graphic design.
2. The company remains ___ the healthcare sector.
3. He has always been ___ his customers.
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Frequently asked questions
Is solid at correct English?
Yes. Solid at means competent or reliable at an activity or skill.
Can I say solid with someone?
Yes. It usually means loyal, supportive, or dependable toward that person.
Does solid on mean knowledgeable?
Yes. Informally, solid on a topic means confident or well informed about it.
Related preposition guides
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