IGNORAMUS, in English law, a phrase which signifies "We are ignorant." This is used, when the grand jury impanelled on the inquisition of criminal causes reject the evidence as too weak to make good the presentment or indictment brought against a person, so as to bring him upon his trial by a petty jury; in which case they indorse this word on the back of the bill of indictment. In consequence of this, all further proceedings against the party accused are stopped, and the supposed offender is delivered without further answer.