invariable

[ in-vair-ee-uh-buhl ]

adjective

1. not variable; not changing or capable of being changed; static or constant.

   Synonyms: unvarying, unchanging, immutable, invariant, changeless, unalterable

noun

1. something that is invariable; a constant.

invariable

/ ɪnˈvɛərɪəbəl /

adjective

1. not subject to alteration; unchanging

noun

1. a mathematical quantity having an unchanging value; a constant

Derived Forms

• inˌvariaˈbility, noun

Other Words From

• in·vari·a·bili·ty in·vari·a·ble·ness noun
• in·vari·a·bly adverb

Word History and Origins

Origin of invariable¹

late Middle English word dating back to 1400–50; in- ³, variable

Example Sentences

It turns out bipedalism is not an invariable feature of humanity and has its own history within our history.

From Singularity Hub 

Those are the words most people who have worked for Zaks invariable use.

From The Daily Beast

The only invariable fact is the steady rise of Taliban potency.

From The Daily Beast

There is no proof positive that it was henceforth his invariable rule to put this kind of finish.

From Project Gutenberg

Silica is an invariable constituent of the ash, but in most plants occurs but in small quantity.

From Project Gutenberg

And the conversations I can reproduce almost verbatim, for, according to my invariable habit, I kept full notes of all he said.

From Project Gutenberg

It by no means follows, however, that virtue is the invariable concomitant of plausible speech.

From Project Gutenberg

This is the invariable characteristic of the house architecture of towns of a certain age.

From Project Gutenberg