IPA: /bɪˈmjuːzmənt/
KK: /bɪˈmjuːzmənt/
A state of confusion or puzzlement, often mixed with amusement.
She looked at him in bemusement when he told her the strange story.
Bemusement is formed from the prefix "be-" (meaning to make or cause) and the root "muse" (from Old French *muser*, meaning to ponder or think). The suffix "-ment" (meaning the result of an action) indicates the state or condition. Together, these parts convey the idea of being made to ponder or think, often in a confused or bewildered manner.
Think of being 'made to ponder' ('be-') and 'to think' ('muse') — that's why bemusement means a state of confusion or puzzlement.