has not been observed

USAGE SUMMARY

The phrase "has not been observed" is correct and usable in written English.
You can use it to state that something has not been seen, noticed, or experienced. For example, "The effects of this new medication have not been observed."

✓ Grammatically correct

Science

Academia

News & Media

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Copulation has not been observed.

Cornell University

Wire breakage has not been observed.

Journal of Rock Mechanics and Geotechnical Engineering

One place the blackout has not been observed?

The Washington Post

This behaviour has not been observed in homogeneous polymer melts.

Polymer

A glitch of this size has not been observed on Chandra's gyros before.

Harvard University

As yet, Sudden Oak Death has not been observed in the East Bay.

University of California, Berkeley

However, the presence of zebra mussels has not been observed in succeeding years.

Nature

Interestingly, however, this effect has not been observed in Mg-Al alloys.

Scripta Materialia

Further, we identified a protein, pigpen, which has not been observed in microglial cells, so far.

Journal of Neuroimmunology

However, the putative prolongevity effect of resveratrol has not been observed in other studies.

Experimental Gerontology

RH3 adopted the intended fold, which has not been observed previously in biological proteins.

Journal of Molecular Biology

Expert writing Tips

Best practice

When using "has not been observed", clearly specify the context or conditions under which the observation was expected. This provides clarity and strengthens the statement's impact.

Common error

Ensure that you are precise about what "has not been observed". Vague statements can weaken your argument. Instead of saying "No effect has been observed", specify the effect you were looking for: "No change in blood pressure has been observed".

Linguistic Context

The phrase "has not been observed" functions as a passive construction indicating the absence of detection or confirmation of something. Ludwig AI confirms its correct usage in various contexts.

Expression frequency: Very common

Frequent in

Science

60%

Academia

21%

News & Media

9%

Less common in

Encyclopedias

2%

Formal & Business

0%

Social Media

0%

Ludwig's WRAP-UP

In summary, the phrase "has not been observed" is a grammatically sound and frequently used expression to indicate the absence of something expected or predicted. Ludwig AI confirms its correct usage. It is particularly common in scientific and academic contexts, where it serves to report a lack of evidence or confirmation. While versatile, it's essential to ensure clarity by specifying the context of the observation to avoid vagueness. Alternatives such as "has not been detected" or "is not apparent" may be suitable depending on the specific nuance you wish to convey.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

has not been detected

Focuses on the lack of detection rather than observation, implying a more technical search.

has not been noticed

Emphasizes the absence of someone becoming aware of something.

has not been seen

Highlights the visual absence of something.

remains unobserved

Uses a more formal tone and emphasizes the continuing state of not being observed.

is not apparent

Shifts the focus to the lack of obviousness or clarity.

is yet to be observed

Indicates that something may be observed in the future, but hasn't been yet.

there's no evidence of

Highlights the lack of proof or indication of something.

has escaped notice

Implies that something was overlooked or not given attention.

remains undocumented

Focuses on the absence of written or recorded evidence.

is not on record

Indicates that something is not officially registered or documented.

FAQs

How can I use "has not been observed" in a sentence?

You can use "has not been observed" to indicate the absence of something expected, like "The side effects "has not been observed" in clinical trials".

What are some alternatives to "has not been observed"?

Depending on the context, alternatives include "has not been detected", "has not been noticed", or "is not apparent".

Is it better to use "has not been observed" or "was not observed"?

"Has not been observed" implies a continuing state or a recent lack of observation. "Was not observed" refers to a specific instance in the past.

What's the difference between "has not been observed" and "has not been seen"?

"Has not been observed" is broader and can apply to any form of data collection, while "has not been seen" specifically refers to visual observation. For instance, a phenomenon might not be observed in data, even if it could be seen directly.