Sentence examples for an unknown reason from inspiring English sources

The phrase "an unknown reason" is correct and usable in written English.
It can be used when referring to a cause or explanation that is not identified or specified.
Example: "The project was delayed due to an unknown reason, leaving the team puzzled about the next steps."
Alternatives: "a mysterious cause" or "an unspecified reason."

Exact(60)

An adolescent koala, seated on a trampoline, cries for an unknown reason, clutching 2mg Xanax and a full-grown hamster, adjacent Krispy Kreme donuts.

Will also wants to find him, but for an unknown reason of his own.

For an unknown reason, the Jeep drove away, the report by the U.S. Park Police states.

The next day she is angry to see that he has, for an unknown reason, clipped and destroyed them all.

However, for an unknown reason, the accuracy with α ≈ 0.03 is smaller than that with α = 0 (results not shown).

For an unknown reason, the site was deserted for many centuries after the end of the 10th century AD.

Investigators believe Trejo walked out of a home for an unknown reason when he was shot outside near the street.

Would a digestive enzyme supplement help treat the symptoms of occasional heartburn, caused by acid reflux, slow stomach emptying, or an unknown reason (like I have)?

The police said he pulled out in front of the oncoming truck at the intersection of two highways and stopped the van for an unknown reason.

Around noon, Ms. Gyles gave the student his birthday punches, 11 for each year, one for good luck and one for an unknown reason, the police said.

"For an unknown reason the driver lost control of the vehicle and the vehicle partially spun around and began to travel in a south-easterly direction.

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