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immutable

If you can't change it, it's immutable. There are many things in life that are immutable; these unchangeable things include death, taxes, and the laws of physics.

The adjective immutable has Latin roots that mean "not changeable." The Latin prefix for not is in, but the spelling changes when the prefix is put before the consonant m. It is im before a root word starting with m as in immutable. If you learn this rule, you'll know the immutable fact that immutable begins with i-m-m.

Definitions of immutable
  1. adjective
    not subject or susceptible to change or variation in form or quality or nature
    “the view of that time was that all species were immutable, created by God”
    synonyms: changeless
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    Antonyms:
    changeable, mutable
    capable of or tending to change in form or quality or nature
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