unaccountably

/ˌʌnəˈkaʊntəbli/
adverb
  1. In a way that cannot be explained or understood; for no clear reason.
    • He felt unaccountably nervous before the simple test.
    • The cat unaccountably refused to eat its favorite food.
    • She was unaccountably late for the meeting, even though she had left home early.
Antonyms
What does "unaccountably" mean? | whatsthatwordmean | whatsthatwordmean