unexplainable
adjective/ˌʌnɪkˈspleɪnəbəl/
Frequency rank: #18,919 most common English word
Meaning
impossible to explain or account for; beyond understanding.

Example sentence
The scientist was fascinated by the unexplainable phenomenon she observed in the laboratory.
Synonyms & related words
- inexplicable
- mysterious
- baffling
- puzzling
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