おそらくは

adverb

probably; most likely; I'm afraid

Expresses a strong conjecture, often with a nuance of regrettable or negative expectation. Frequently used when predicting an undesirable outcome.

• おそらくは雨あめが降ふるだろう。

  It will probably rain.

• おそらくは彼かれは来こないと思おもう。