Synonyms of 'inscrutable'
1 enigmaticDictionary, blank, impenetrableIt is important to keep a straight face and remain inscrutable.
2 mysteriousDictionary, incomprehensible, inexplicableEven when opened the contents of the package were as inscrutable as ever.
He died in mysterious circumstances.
incomprehensible mathematics puzzles
His behaviour was extraordinary and inexplicable.
He muttered something unintelligible.
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He gave him a blank look.
Deadpan humour is when you appear to be serious and are hiding the fact that you are joking or teasing someone.
his deadpan expression
Thesaurus for inscrutable from the Collins English Thesaurus
If a person or their expression is inscrutable , it is very hard to know what they are really thinking or what they mean.