un·ac·count·a·bly
adverb/ˌʌnəˈkaʊntəbli/
/ˌʌnəˈkaʊntəbli/
(formal)- in a way that is very difficult to explain; without any obvious reason
难以解释地；莫名其妙地；无明显原因地 - He has been unaccountably delayed.
他被莫名其妙地耽误了。 - She felt suddenly and unaccountably cheerful.
她突然感到莫名的高兴。
- He has been unaccountably delayed.