Unexplained
/ˌʌnɪˈkspleɪnd/
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Definition
(adj) Not explained; of unknown cause or origin.
Sentence Examples
Do you have any unexplained bruising or bleeding?
Have you recently had any unexplained dizziness or lightheadedness?
CEFR Practice Quiz
The scientists are still trying to find a cause for the ____ phenomenon that was observed in the night sky today.