Translation

予期せぬ / 思いがけない / 予想外の

Meaning

Not expected or predicted; something that comes as a surprise.

Examples

• The project faced unanticipated challenges, causing delays in its completion.
  プロジェクトは予期せぬ困難に直面し、完了が遅れた。
• Her promotion was completely unanticipated, as she had only been with the company for a year.
  彼女の昇進は完全に予想外だった。入社してまだ1年だったからだ。