Webster's Revised Unabridged Dictionary · 1913

Utmost

Utmost , adjective

[Old English utmeste, utemest, Anglo-Saxon {not transcribed}temest, a superlative from {not transcribed}te out. {not transcribed}. See Out, and compare Aftermost, Outmost, Uttermost.]

1.
Situated at the farthest point or extremity; farthest out; most distant; extreme; as, the utmost limits of the land; the utmost extent of human knowledge. — Spenser
We coasted within two leagues of Antibes, which is the utmost town in France. — Evelyn
Betwixt two thieves I spend my utmost breath. — Herbert
2.
Being in the greatest or highest degree, quantity, number, or the like; greatest; as, the utmost assiduity; the utmost harmony; the utmost misery or happiness.
He shall answer... to his utmost peril. — Shakespeare
Six or seven thousand is their utmost power. — Shakespeare

Utmost , noun

The most that can be; the farthest limit; the greatest power, degree, or effort; as, he has done his utmost; try your utmost.
We have tried the utmost of our friends. — Shakespeare