定さだめて

adverb

surely; certainly; no doubt

Expresses strong conviction or assumption, often used in literary or formal contexts. Similar to きっと but slightly more emphatic and less colloquial.

• 定さだめてご両りょう親しんもお喜よろこびのことでしょう。

  Surely your parents must be delighted as well.

• 彼かれなら定さだめて成せい功こうするに違ちがいない