is again unknown

USAGE SUMMARY

The phrase "is again unknown" is correct and usable in written English.
It can be used when referring to something that has become unknown once more after being known previously. Example: "The cause of the sudden outage is again unknown, leaving the technicians puzzled."

✓ Grammatically correct

Science

News & Media

Wiki

Human-verified examples from authoritative sources

Exact Expressions

3 human-written examples

A further advanced pregnancy was reported in September 1582 by the French ambassador, yet the outcome is again unknown.

Wikipedia

TNAP is an enzymatic generator of inorganic phosphate and an established essential promoter of tissue mineralization, but it is again unknown how diminished TNAP activity leads to craniosynostosis [ 41, 58].

BioMed Research International

It has recently been shown to be overexpressed in a variety of human tumours [ 8], being one of the 16 most upregulated proteins in superinvasive cancer cells, although its function is again unknown [ 9].

BMC Evolutionary Biology

Human-verified similar examples from authoritative sources

Similar Expressions

57 human-written examples

Security experts found that the attacker — which was again unknown — was hijacking internet traffic to send visitors to websites that contained scripts from Chinese search engine Baidu to the two pages.

TechCrunch

where ω j n and θ k n are again unknown smooth functions defined on an interval [ 0, T n ], T n ≤ T. Evidently, the boundary conditions v n ( 0, t ) = v n ( 1, t ) = ω n ( 0, t ) = ω n ( 1, t ) = ∂ θ n ∂ x ( 0, t ) = ∂ θ n ∂ x ( 1, t ) = 0 (64).

Boundary Value Problems

The reasons for these recent changes in incidence are again unknown.

Emerging Infectious Diseases

The MEM as described previously for this setting (Foulkes et al., 2005) can be formulated as follows: (4) where ν and Γ are again unknown parameters,, is an indicator for individual i belonging to genotype group g j, is a vector of corresponding random effects of genotype groups on the trait under study, for, and b j and ε i are independent.

Biometrical Journal

How close she can return to her former dominating self is again the great unknown, but there seemed to be an eagerness to believe that the next few days could favorably alter Vonn's condition.

The New York Times - Sports

Under these hypotheses, the previously described trial encryption-and-comparison discovery of an unknown plaintext is again possible, irrespectively of high min-entropy or any secret encoding of the plaintexts (thus, any transformation to increase the uncertainty would be non-effective).

EURASIP Journal on Information Security

Look 26 (and 27) is a very direct reference to a 1985 polka dot dress (whose designer is unknown, but is again, perhaps, Jasper Conran) Diana wore on a trip to Italy in 1985.

Vice

In the matching evening view, the sunset light touching the edges of the leafy trees is again rendered with a precision previously unknown in European landscape painting, and the country folk at work are observed from life as never before.

The New York Times - Arts

Expert writing Tips

Best practice

Use "is again unknown" when you want to emphasize that something was once known, then became known again, and is now once more unknown. This can be particularly effective in scientific or historical contexts where information is sometimes lost and rediscovered. For example: "The exact mechanism of this reaction is again unknown, prompting further research."

Common error

Avoid using "is again unknown" when "is unknown" suffices. The 'again' implies a prior state of knowledge, so its use is inappropriate if the subject has never been known. Instead of saying "The chef's secret ingredient is again unknown", when it has never been revealed, use "The chef's secret ingredient is unknown".

Linguistic Context

The phrase "is again unknown" functions as an adverbial phrase that modifies a verb, adjective, or another adverb, indicating a state of renewed or repeated uncertainty. As Ludwig AI points out, it's grammatically correct and usable in written English. It suggests that something which was once known has reverted to a state of being unknown.

Expression frequency: Common

Frequent in

Science

60%

News & Media

30%

Wiki

10%

Less common in

Formal & Business

0%

Encyclopedias

0%

Reference

0%

Ludwig's WRAP-UP

In summary, the phrase "is again unknown" is a grammatically correct and usable expression that conveys a recurrent state of uncertainty or lack of knowledge. According to Ludwig AI, it effectively communicates that something previously known has once more become unknown. It appears frequently in scientific and news contexts and, while versatile, should be used judiciously to avoid redundancy. When using this phrase, ensure that it accurately reflects a situation where information has genuinely been lost and rediscovered previously. Be aware that there are numerous alternative phrases, such as "is once again unknown" or "has become unknown again", which may better suit the specific nuance you want to convey.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

is once again unknown

Replaces "again" with "once again" for emphasis on the repeated lack of knowledge.

has become unknown again

Emphasizes the process of something reverting to an unknown state.

is unknown anew

Uses "anew" to indicate a fresh state of being unknown.

is still a mystery

Shifts from stating a lack of knowledge to emphasizing the mysterious nature of the subject.

remains shrouded in mystery

Highlights the obscurity and ambiguity surrounding the subject.

is once more obscure

Replaces "unknown" with "obscure", emphasizing a lack of clarity.

has relapsed into obscurity

Suggests a prior state of understanding that has been lost.

is now unclear once more

Focuses on the absence of clarity rather than just a lack of knowledge.

is uncertain once more

Highlights the uncertainty and doubt surrounding the subject.

we are again in the dark

Uses a metaphor to express the lack of knowledge from a personal perspective.

FAQs

How can I use "is again unknown" in a sentence?

Use "is again unknown" when you want to emphasize that something was once known, became known again, and is now once more unknown. For example: "The precise location of the treasure is again unknown after the map was lost".

What are some alternatives to "is again unknown"?

Alternatives include "is once again unknown", "has become unknown again", or "is still a mystery", depending on the context.

When is it appropriate to use "is again unknown" over simply "is unknown"?

"Is again unknown" is appropriate when the information was previously known, then forgotten or lost, and now remains unknown. "Is unknown" is suitable when the information has never been known.

What does the phrase "is again unknown" imply?

The phrase "is again unknown" implies a cyclical pattern of knowledge and ignorance, suggesting that information was once available, then lost, and now remains lost or unconfirmed.