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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
by contrary
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "by contrary" is correct and usable in written English.
It is used to mean the opposite of what is being said, or in contrast to something. For example: "He thought the vacation would be relaxing, but by contrary, he found it to be quite tiring."
✓ Grammatically correct
Science
News & Media
Encyclopedias
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
38 human-written examples
By contrary, a progressive decay of the photocatalytic activity is observed for the other contaminants.
Science
As in Doctor Foster, what characters and viewers believe they are seeing is constantly qualified by contrary information.
News & Media
Married for 12 years, with time taken away by war and now with three small children, they fret in a tacky house in Westport, Conn., driven by contrary social aspirations and not enough money to enjoy any of it.
News & Media
Where is your compassion?" Though these characterizations are leavened by contrary details — Paul turns out to have some compassion after all; Maddie watches "Survivor" — they are not enough to bring them to life.
News & Media
By contrary, when tested in positive potential window (0 0.6 V), the NiCoS NRAs show a maximum specific capacitance of ∼800 F g-1 at 12 mA cm−2.
Science
To take the most striking example, in a large part of Germany, until the adoption of a common code for the whole empire in 1900, the Roman law was in force as "subsidiary law"; that is, it was applied unless excluded by contrary local provisions.
Encyclopedias
Human-verified similar examples from authoritative sources
Similar Expressions
22 human-written examples
Indeed, we see larger possibilities in this method of preceeding by contraries.
News & Media
By contraries, the averaged Nusselt number was decreased with increase in jet temperature which is larger than 200 °C in the H/D = 0.25 case.
D2A4 depends on Causality and No Causation by Contraries, D2A12 depends on No Causation by Contraries, and D2A14C depends on D2A12C.
Science
But there are reasons for thinking that No Causation by Contraries is false.
Science
But, again by No Causation by Contraries, this result is absurd: nothing that is unequal could make something be equal.
Science
Expert writing Tips
Best practice
When using "by contrary", ensure it clearly introduces a statement that opposes or contrasts with a previous one. Consider whether a more common alternative like "on the contrary" might improve clarity for your audience.
Common error
Avoid using "by contrary" if the contrast isn't immediately obvious. Overuse can make your writing sound stilted or confusing. Choose alternative phrasing when clarity is paramount.
Source & Trust
77%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "by contrary" functions as a prepositional phrase used to introduce a statement that is the opposite of or contradicts a previous one. It serves to highlight a contrast or reversal of expectation. This is supported by Ludwig's examples, which show it used in various contexts to signal opposition.
Frequent in
Science
50%
News & Media
30%
Encyclopedias
20%
Less common in
Academia
0%
Formal & Business
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, the phrase "by contrary" is a grammatically correct prepositional phrase used to introduce a statement that opposes a previous one. Ludwig indicates that it's a valid and usable phrase, although less common than alternatives like "on the contrary". The phrase is most frequently found in scientific and journalistic contexts. While grammatically sound, its relative infrequency suggests that writers should consider more common alternatives for improved clarity and readability, especially when writing for a broad audience. Using more widely recognized phrases can help ensure that your message is easily understood.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
on the contrary
Represents a more direct and common way to express opposition.
conversely
Indicates a reversal or opposition in the previous statement.
in contrast
Highlights the difference between two things being compared.
to the contrary
Used to indicate that something is the opposite of what has been said or implied.
on the other hand
Introduces a contrasting point of view or consideration.
in opposition
Emphasizes the state of being against something.
unlike that
Simple way to state that something is not of the same nature as something else
in contradiction
Highlights that two ideas or statements are opposed.
contrary to that
It serves to highlight that the second point is contradictory to the first
in defiance
Signifies resistance or opposition to something.
FAQs
How can I use "by contrary" in a sentence?
Use "by contrary" to introduce a statement that opposes a previous one. For example: "He expected the meeting to be short; by contrary, it lasted for hours."
What's a more common alternative to "by contrary"?
A more common alternative is "on the contrary". It serves the same purpose of introducing an opposing statement but is more widely recognized and used.
Is "by contrary" formal or informal?
"By contrary" tends to be more formal than other phrases. In casual conversation, "on the other hand" or "conversely" might be more suitable.
What's the difference between "by contrary" and "in contrast"?
"By contrary" introduces a direct opposition, while "in contrast" simply highlights the difference between two things. "By contrary" implies a stronger disagreement or reversal.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
77%
Authority and reliability
4.1/5
Expert rating
Real-world application tested