utmost

[ uht-mohst or, esp. British, -muhst ]
/ ˈʌtˌmoʊst or, esp. British, -məst /

adjective

of the greatest or highest degree, quantity, or the like; greatest: of the utmost importance.
being at the farthest point or extremity; farthest: the utmost reef of the island.

noun

Also uttermost. the greatest degree or amount: the utmost that can be said; The hotel provides the utmost in comfort.
the most or best of one's abilities, powers, etc.: He did his utmost to finish on time.
the extreme limit or extent: His patience was taxed to the utmost.

Origin of utmost

before 900; Middle English utmest, Old English ūtemest. See out, -most

Can be confused

upmost uppermost utmost
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for utmost

British Dictionary definitions for utmost

utmost

uttermost

/ (ˈʌtˌməʊst) /

adjective (prenominal)

of the greatest possible degree or amountthe utmost degree
at the furthest limitthe utmost town on the peninsula

noun

the greatest possible degree, extent, or amounthe tried his utmost

Word Origin for utmost

Old English ūtemest, from ūte out + -mest most
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012