Princeton's WordNet

1. utmost, uttermost, maximum, level best(adj)

   the greatest possible degree

   "he tried his utmost"

2. extreme, utmost(a), uttermost(a)(adj)

   of the greatest possible degree or extent or intensity

   "extreme cold"; "extreme caution"; "extreme pleasure"; "utmost contempt"; "to the utmost degree"; "in the uttermost distress"

3. last, utmost(adj)

   highest in extent or degree

   "to the last measure of human endurance"; "whether they were accomplices in the last degree or a lesser one was...to be determined individually"

4. farthermost, farthest, furthermost, furthest, utmost, uttermost(adj)

   (comparatives of `far') most remote in space or time or order

   "had traveled to the farthest frontier"; "don't go beyond the farthermost (or furthermost) tree"; "explored the furthest reaches of space"; "the utmost tip of the peninsula"

Wiktionary

1. utmost(Noun)

   maximum; greatest possible amount or quantity.

2. utmost(Adjective)

   Situated at the most distant limit; farthest

3. utmost(Adjective)

   The most extreme; ultimate; greatest

Webster Dictionary

1. Utmost(adj)

   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

2. Utmost(adj)

   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

3. 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

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