Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
was proficient in
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "was proficient in" is correct and usable in written English.
It can be used to describe someone's skill or expertise in a particular area or subject. Example: "She was proficient in multiple programming languages, which made her an asset to the development team."
✓ Grammatically correct
News & Media
Science
Encyclopedias
Alternative expressions(19)
excelled in
showed expertise in
demonstrated proficiency in
excelled at
mastered
outperformed in
demonstrated expertise in
but was greater in
was greater in
been more successful in
achieved greater success in
proven more effective at
did a better job at
did a good job at
did a decent job at
scored well for
performed admirably in
did well in
gained recognition for
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
39 human-written examples
She was a good singer, and was proficient in the piano, violin and Japanese harp.
News & Media
Sam Mitchell was proficient in the middle, ably assisted by captain Luke Hodge.
News & Media
His Grenadian-born mother was proficient in French and taught her children the language.
News & Media
Luis Martinez, the driver, chuckled when asked if he was proficient in the Asian language.
News & Media
Downes was proficient in italian and German from his time with Scherchen.
News & Media
Mansingh was trained in Hindustani and Carnatic classical vocal music and was proficient in the Sanskrit and German languages.
Encyclopedias
Human-verified similar examples from authoritative sources
Similar Expressions
20 human-written examples
Seventy-five percent were proficient in math, compared with 70percentt statewide.
News & Media
Two years later, they should be proficient in multiplying and dividing them.
News & Media
In New York City, 81 percent of students are deemed proficient in math, and 68.8 percent are proficient in English.
News & Media
In 2002, 98percentt of fourth graders who took the Elementary School Proficiency Assessment test were found to be proficient in language arts and 92percentt were proficient in math.
News & Media
In 2009, 96 percent of their fifth graders were proficient in English, 89 percent in math.
News & Media
Expert writing Tips
Best practice
Use "was proficient in" to clearly indicate a developed skill or expertise acquired through training or experience. For instance, "She was proficient in data analysis, allowing her to extract key insights."
Common error
Be cautious about using "was proficient in" for skills that are considered basic or expected for a particular role. Instead, reserve it for skills that significantly exceed expectations. "He was proficient in email communication" is less impactful than "He was proficient in advanced statistical modeling".
Source & Trust
86%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "was proficient in" functions as an adjective phrase that modifies a subject, indicating a high level of skill or competence in a specific area. As Ludwig AI confirms, it accurately and effectively describes someone's expertise, supported by numerous real-world examples.
Frequent in
News & Media
40%
Science
35%
Encyclopedias
7%
Less common in
Wiki
3%
Formal & Business
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, the phrase "was proficient in" is a grammatically sound and frequently used way to describe someone's developed expertise or skill in a particular area. Ludwig AI confirms its correctness and broad applicability, supported by many examples from diverse sources such as news media and scientific publications. While alternatives like "was skilled at" or "excelled in" exist, "was proficient in" is particularly effective for conveying a sense of acquired competence through training or experience. Be mindful of overstating basic skills and aim to use it when highlighting significant expertise.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
was skilled at
Emphasizes general skill rather than formal proficiency. Less formal.
was adept at
Suggests a natural talent or quickness in learning. Implies ease.
excelled in
Indicates superior performance; surpasses basic proficiency. Highlights excellence.
had expertise in
Focuses on specialized knowledge or skill. More formal.
was accomplished in
Suggests a high level of achievement and mastery. More formal.
was competent in
Implies sufficient skill to meet requirements. More neutral.
had a flair for
Suggests a natural aptitude and enthusiasm. More informal.
was masterful in
Emphasizes exceptional control and skill. More emphatic.
was well-versed in
Highlights comprehensive knowledge rather than just skill. Focuses on understanding.
was au fait with
Indicates familiarity and ease with a subject. More informal and may sound dated.
FAQs
How can I use "was proficient in" in a sentence?
Use "was proficient in" to describe someone's high level of competence in a particular skill or area. For example, "She "was proficient in" several programming languages" indicates she had a strong grasp of those languages.
What are some alternatives to "was proficient in"?
Alternatives include phrases like "was skilled at", "was adept at", or "excelled in". The best choice depends on the specific context and the nuance you want to convey.
Is it better to say "was proficient in" or "had proficiency in"?
"Was proficient in" is more common and natural-sounding when describing a person's skill. "Had proficiency in" is grammatically correct but less frequently used in everyday language.
What's the difference between "was proficient in" and "was good at"?
"Was proficient in" suggests a higher degree of skill and formal training or experience compared to "was good at". "Was good at" implies a natural talent or basic competence, while "was proficient in" indicates mastery.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
86%
Authority and reliability
4.6/5
Expert rating
Real-world application tested