Something immeasurable can't be measured or quantified. It's too vast.

When you measure something, you check how long it is, how much it weighs, or some other measurable aspect. If something is immeasurable, then measuring is impossible. The numbers of stars in the sky is immeasurable: we can't know how many there are. The number of grains of sand on a beach is immeasurable: they can’t be counted. This word means more than a lot. There are a lot of countries in the world, but they're not immeasurable.

Definitions of immeasurable
  1. adjective
    impossible to measure
    synonyms: immensurable, unmeasurable, unmeasured
    very great; limitless
    illimitable, limitless, measureless
    without limits in extent or size or quantity
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    measurable, mensurable
    capable of being measured
  2. adjective
    beyond calculation or measure
    immeasurable wealth”
    synonyms: incomputable, inestimable
    not capable of being computed or enumerated
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