utmost

/ˈət-ˌmōst/

Middle English, alteration of utmest, from Old English ūtmest, superlative adjective, from ūt out, adverb

adjective

  1. situated at the farthest or most distant point : extreme

  2. of the greatest or highest degree, quantity, number, or amount

the utmost point of the earth

noun

  1. the most possible : the extreme limit : the highest attainable point or degree

  2. the highest, greatest, or best of one's abilities, powers, and resources

the utmost in reliability

idiom

  1. to do all one can

We did our utmost to help.