There are two Greek words for “deny” in the New Testament.
720. ἀρνέομαι arneomai, ar-neh´-om-ahee; perhaps from 1 (as a negative particle) and the middle voice of 4483; to contradict, i.e. disavow, reject, abnegate: — deny, refuse.
and
533. ἀπαρνέομαι aparneomai, ap-ar-neh´-om-ahee; from 575 and 720; to deny utterly, i.e. disown, abstain: — deny.