Immutable

hard

ih-MYOO-tuh-bul

adjective

Definition

Unchanging over time or unable to be changed

Examples

The laws of physics are immutable and universal.
His commitment to honesty was immutable throughout his life.

Synonyms

unchangeablefixedunalterableinvariable

Antonyms

mutablechangeablevariablevolatile

Categories

GRE Tip

Immutable is a hard-difficulty GRE word. On the GRE, you might see it paired with synonyms like "unchangeable" or "fixed" in Sentence Equivalence questions. Look for contrast clues (however, despite, although) that signal the opposite meaning. Words like "mutable".

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