Synonyms of the word

invariable

• adj. Not variable; unalterable; uniform; always having the same value.
• adj. (mathematics) Constant.
• adj. (by extension, grammar, of a word, or a grammatical class) That cannot undergo inflection, conjugation…
• n. Something that does not vary; a constant.

changeless

• adj. unchanging.

consistent

• adj. Of a regularly occurring, dependable nature.
• adj. Compatible, accordant.
• adj. (logic) Of a set of statements, such that no contradiction logically follows from them.
• n. (in the plural, rare) Objects or facts that are coexistent, or in agreement with one another.
• n. In the history of the Eastern Orthodox Church, a kind of penitent who was allowed to assist at prayers,…

constant

• adj. Unchanged through time or space; permanent.
• adj. Consistently recurring over time; persistent.
• adj. Steady in purpose, action, feeling, etc.
• adj. Firm; solid; not fluid.
• adj. (obsolete) Consistent; logical.
• n. That which is permanent or invariable.
• n. (algebra) A quantity that remains at a fixed value throughout a given discussion.
• n. (sciences) Any property of an experiment, determined numerically, that does not change under given circumstances.
• n. (computing) An identifier that is bound to an invariant value; a fixed value given a name to aid in readability…

hard-and-fast

• adj. (idiomatic, of rules, etc) strictly maintained.

invariant

• adj. not varying; constant.
• adj. (mathematics) Unaffected by a specified operation (especially by a transformation).
• adj. (computing, programming) Neither covariant nor contravariant.
• n. An invariant quantity, function etc.

quantity

• n. A fundamental, generic term used when referring to the measurement (count, amount) of a scalar, vector,…
• n. An indefinite amount of something.
• n. A specific measured amount.
• n. A considerable measure or amount.
• n. (metrology) Property of a phenomenon, body, or substance, where the property has a magnitude that can…
• n. (mathematics) Indicates that the entire preceding expression is henceforth considered a single object.

strict

• adj. Strained; drawn close; tight.
• adj. Tense; not relaxed.
• adj. Exact; accurate; precise; rigorously nice.
• adj. Governed or governing by exact rules; observing exact rules; severe; rigorous.
• adj. Rigidly interpreted; exactly limited; confined; restricted.
• adj. (botany) Upright, or straight and narrow; — said of the shape of the plants or their flower clusters.
• adj. Severe in discipline.

unvarying

• adj. persistent, constant or changeless.
• adj. lacking variety; having a uniform character.