Etymology
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utmost (adj.)

Old English utmest (Anglian) "outermost," double superlative of ut "out" (see out (adv.)) + -most. Meaning "being of the greatest or highest degree" is from early 14c.

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Definitions of utmost
1
utmost (adj.)
of the greatest possible degree or extent or intensity;
utmost contempt
to the utmost degree
Synonyms: extreme / uttermost
utmost (adj.)
highest in extent or degree;
Synonyms: last
utmost (adj.)
(comparatives of `far') most remote in space or time or order;
the utmost tip of the peninsula
Synonyms: farthermost / farthest / furthermost / furthest / uttermost
2
utmost (n.)
the greatest possible degree;
he tried his utmost
Synonyms: uttermost / maximum / level best
From wordnet.princeton.edu