unaccountably [ˌʌnəˈkaʊntəblɪ]

例句:

• And then, unaccountably, she giggled.
  接着，她莫名其妙地咯咯笑了起来。
  
• Leonard felt unaccountably happy.
  伦纳德感到说不出的高兴。
  
• He has been unaccountably delayed.
  他被莫名其妙地耽误了。
  
• Except that across the water, perspectives were altering unaccountably.
  来自THETIMES
• If you are unaccountably yachtless, there are four different hotels to stay in.
  来自THETIMES
• Unaccountably, neither Montagu nor Cholmondeley seems to have written mysteries of his own.
  来自NEWYORKER