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utmost

adj. · n.
US //ˈətˌmoʊst// UK //ˈʌtməʊst// ut·most
  1. 1 greatest or highest degree (adj.)
    C1 Advanced Formal

    the greatest or most extreme amount of something.

    of the greatest or highest degree, quantity, or the most extreme limit.

    Example

    This medical procedure requires the utmost care and attention from the surgeons.

    Example

    The safety of the passengers is of the utmost importance to the airline, and no technical fault is ever ignored.

    Usage

    Usually placed before the noun it modifies.

  2. 2 most distant (adj.)
    C2 Proficiency Literary

    the furthest away or most distant point.

    situated at the most distant limit or the outermost point.

    Example

    The explorers travelled to the utmost reaches of the frozen continent.

    Example

    The signal was broadcast to the utmost limits of the solar system, though it would take years to reach any potential receiver.

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  1. 3 one's best effort (n.)
    C1 Advanced Formal

    the most that someone can possibly do.

    the greatest possible capability, extent, or effort that an individual can exert.

    Example

    I will do my utmost to finish the report by the end of the day.

    Example

    The rescue team did their utmost to reach the trapped climbers before the blizzard made further progress impossible.

    Usage

    Commonly used in the phrase 'to do one's utmost'.

Origin

PIE word *úd From Middle English utmost, utemest [and other forms], from Old English ūtmest, ūtemest [and other forms], from ūt, ūte (“out; outdoors, outside”) + -mest (suffix meaning ‘furthest’, used to form superlatives of some adjectives) (and conflated with most). Ūt is derived from Proto-Germanic ūt (“out, outward”), from Proto-Indo-European úd (“out, outward”). Equivalent to out + -most.

Word family
Idioms1 entry

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