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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
not as fast
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "not as fast" is correct and usable in written English.
You can use it to compare the speed of two or more things, indicating that one is slower than the other. Example: "The new model is not as fast as the previous version, but it offers better features."
✓ Grammatically correct
News & Media
Science
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
59 human-written examples
Maybe not as fast.
News & Media
Not as fast as we were.
News & Media
But he's not as fast as Trulli.
News & Media
But not as fast as Harry Hill.
News & Media
Medicare spending will keep increasing, only not as fast.
News & Media
It makes me thorough but not as fast as many.
News & Media
They're not as fast and quick as you think.
News & Media
"The turnover is not as fast," Ms. Rosenberg said.
News & Media
"There's a lot happening, but not as fast as needed.
News & Media
Not as fast as our tour bus, but moving.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
One might argue that co-stimulation blockade is not as fast-acting as TNF blockade.
Expert writing Tips
Best practice
When comparing speeds, ensure the context clearly identifies what is being compared with "not as fast". For example, "This car is "not as fast" as a race car".
Common error
Avoid using "not as fast" without a clear reference point. Saying "It's "not as fast"" is incomplete. Instead, specify what it is slower than to avoid ambiguity.
Source & Trust
92%
Authority and reliability
4.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "not as fast" functions as a comparative phrase, indicating that something possesses less speed than something else. Ludwig AI confirms its correctness. Examples show it used to compare the speed of physical objects, processes, or even personal progress.
Frequent in
News & Media
71%
Science
11%
Formal & Business
6%
Less common in
Wiki
2%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, "not as fast" is a common and grammatically sound comparative phrase used to indicate that something is slower than something else. Ludwig AI validates its correct usage, and its prevalence in news and media showcases its neutrality and broad applicability. When using "not as fast", ensure a clear comparison is made. Alternatives like "slower than" or "less rapid than" can be used depending on the context. Avoid ambiguity by always specifying what is being compared. As seen in Ludwig, "not as fast" effectively communicates relative speed across various domains.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
slower than
Directly indicates a reduced speed, providing a simpler alternative.
less rapid than
More formal and emphasizes the quickness of movement.
not quite as quick
Uses "quick" instead of "fast", implying a slight difference in speed.
at a reduced pace
Focuses on the rate of movement rather than direct speed.
more leisurely
Suggests a relaxed and unhurried approach.
not up to speed
Idiomatic expression indicating a lack of necessary speed or progress.
lagging behind
Implies a trailing position due to slower speed.
moving more slowly
Verbose but clear description of reduced speed.
not accelerating as quickly
Focuses on the rate of acceleration.
less swift
Uses "swift", implying graceful and rapid movement, but to a lesser degree.
FAQs
What can I say instead of "not as fast"?
You can use alternatives like "slower than", "less rapid than", or "not quite as quick" depending on the context.
How do I use "not as fast" in a sentence?
Use "not as fast" to compare the speed of two things, showing one is slower. Example: "The delivery service is "not as fast" as it used to be".
What is the difference between "not as fast" and "slower"?
"Not as fast" is a comparative phrase, while "slower" is a comparative adjective. "Slower" is typically more concise, but "not as fast" can add emphasis or nuance. For instance, the phrase "not as fast" can be used in place of "less rapid than".
Is it correct to say "not so fast" instead of "not as fast"?
While "not so fast" is grammatically correct, it usually implies a command to stop or slow down, rather than a direct comparison of speed. It's used to caution someone, whereas "not as fast" is a direct comparison, so choose the right one for the context.
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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
92%
Authority and reliability
4.8/5
Expert rating
Real-world application tested