unknowncause
nounUK /ʌnˈnəʊn kɔːz/
US /ʌnˈnoʊn kɔːz/
An unknown cause is a reason for something that nobody knows yet.
The doctor said the boy's rash had an unknowncause, so she ran more tests.
OTHER MEANINGS
2. A situation where the reason for a problem cannot be found.
The fire was blamed on an unknowncause.
3. A label used when scientists cannot yet explain why something happens.
The illness was listed as an unknowncause in the report.
4. Something whose beginning or source is a secret or a puzzle.
The strange noise in the attic had an unknowncause.