unaccountably
🇺🇸
/ˌʌnəˈkaʊntəbli/
🇬🇧
/ˌʌnəˈkaʊntəbli/
adverb
R
in a way that is hard to understand or explain; for an unknown reason
She felt suddenly and unaccountably cheerful, even though she had just received bad news.
尽管她刚收到坏消息，她却突然感到莫名其妙的高兴。
translation
莫名其妙