“uttermost” – English explanatory dictionary

a. [From Utter, a.; cf. Utmost, and Outermost.] Extreme; utmost; being; in the farthest, greatest, or highest degree; as the uttermost extent or end. ´In this uttermost distress.´ Milton.

n. The utmost; the highest or greatest degree; the farthest extent. Tennyson. “Wherefore he is able also to save them to the uttermost that come unto God by him.” Heb. vii. 25. “He cannot have sufficient honor done unto him; but the uttermost we can do, we must.” Hooker.