恐おそるべし

na-adjective

awesome; incredible; formidable

A fixed expression derived from classical Japanese (恐る + べし), used as a na-adjective to express admiration, awe, or sometimes ironic amazement at something impressive or daunting.

• 彼かれの集しゅう中ちゅう力りょくは恐おそるべしだ。

  His concentration is incredible.

• このゲームの難なん易い度どは恐おそるべし。

  The difficulty of this game is formidable.