This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
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adj. Not subject or susceptible to change.

adj. Unable to be changed without exception.

adj. Not able to be altered in the memory after its value is set initially, such as a constant.

n. Something that cannot be changed.

adj. Not mutable; not capable or susceptible of change; unchangeable; unalterable.

Not mutable; not capable or susceptible of change; not subject to mutation; unchangeable; invariable; unalterable.

In zoology, not subject to variation in different individuals of a species; permanent: as, immutable characters or marks

adj. not subject or susceptible to change or variation in form or quality or nature

"Even space, seemingly immutable, is able to be truncated by circumstance."

nonimmutable    mutable   

immutable accent   

unchangeable    unalterable   

disputable    indisputable    inscrutable    irrefutable    mutable    suitable    unsuitable   

unchangeable    unchanging    indestructible    eternal    immovable    indivisible    inexorable    changeless    incorruptible    invariable