unsolved

/ ʌnˈsɒlvd /

adjective

1. not having been solved or explained

   several unsolved murders

Other Word Forms

• unsolvable adjective

Example Sentences

Belief in witchcraft is also so deeply ingrained in Sierra Leone, even among many police officers, that there is often a fear of pursuing cases further - and most go unsolved.

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It is one of the world's most famous unsolved codes whose answer could sell for a fortune -- but two US friends say they have already found the secret hidden by "Kryptos."

Read more on Barron's

Plus, there are still unsolved energy constraints facing the AI boom.

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The killings in the Valley of the Christians are also unsolved.

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This means high-risk, massive capital requirements, unclear timelines and unsolved fundamental technical problems.

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Related Words

• moot 
• pending 
• unanswered 
• undecided 
• undetermined 
• unsettled