Synonyms of invariable

invariable

adjective

(ˌ)in-ˈver-ē-ə-bəl 

as in unchangeable

not capable of changing or being changed

an invariable interest rate

Synonyms & Similar Words

• unchangeable
• fixed
• unchanging
• unalterable
• immutable
• determinate
• constant
• steadfast
• hard-and-fast
• inalterable
• inflexible
• steady
• unvarying
• established
• stable
• changeless
• unaltered
• incommutable
• settled
• immovable
• set
• unmovable

Antonyms & Near Antonyms

• variable
• elastic
• flexible
• changeable
• adjustable
• adaptable
• uncertain
• mutable
• unstable
• varying
• alterable
• fickle
• unsettled
• plastic
• inconstant
• fluctuating
• pliable
• pliant
• willowy
• supple

Example Sentences

Recent Examples of invariable

Exoplanets with orbits tilted with respect to their invariable plane could disrupt the rest of their system. — Doris Elin Urrutia, Space.com, 8 June 2026

Among other things, Marx is invoking the algebraic distinction between known and invariable (constant) and unknown (variable) values. — Literary Hub, 22 Sep. 2025

God will always be the sole source of each one’s invariable, operable, ceaseless good. — Jan Keeler Vincent, Christian Science Monitor, 15 Aug. 2025