違ちがいない

expression, i-adjective

certain; sure; without doubt; there is no mistaking it

Expresses the speaker's strong certainty or inference. Most often used as に違いない after a noun, adjective, or clause, meaning “must be” or “there is no doubt that ...”.

• この匂においはカレーに違ちがいない。

  This smell must be curry.

• 彼かれはもう家いえに着ついているに違ちがいない。

  He must have arrived home by now.

• あの人ひとが犯はん人にんに違ちがいない。

  That person is surely the culprit.