indivisible

Something indivisible cannot be broken up or divided: it's rock solid.

The most common use of the word indivisible is in the Pledge of Allegiance, where it is used to show how our country is united and can't be broken up. But you can use this word for any group or organization that seems indestructible. Anything that can be broken up, separated, or smashed into pieces is divisible, not indivisible. In math, you can say that the number 9 is indivisible by 2: it can't be divided by 2 evenly.

Definitions of indivisible
  1. adjective
    impossible to split into parts
    “an indivisible union of states”
    “one nation indivisible
    Synonyms:
    indiscrete
    not divided or divisible into parts
    indivisible by, undividable
    cannot be divided without leaving a remainder
    inseparable
    not capable of being separated
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    Antonyms:
    divisible
    capable of being or liable to be divided or separated
    cleavable
    capable of being cleaved
    dissociable, separable, severable
    capable of being divided or dissociated
    dissociative
    tending to produce dissociation
    dividable
    can be divided usually without leaving a remainder
    partible
    (of e.g. property) capable of being parted or divided
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