unfathomable
adjective/ʌnˈfæðəməbl/
/ʌnˈfæðəməbl/
(formal)- too strange or difficult to be understood
- an unfathomable mystery
- We are confronted with the unfathomable nature of human motivation.
- if somebody has an unfathomable expression, it is impossible to know what they are thinking
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unfathomable