Synonyms of the word

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…

ceaseless

• adj. Without an end.
• adj. Without stop or pause, incessant.

changeless

• adj. unchanging.

continual

• adj. Recurring in steady, rapid succession.
• adj. (proscribed) Seemingly continuous; appearing to have no end or interruption.
• adj. (proscribed) Forming a continuous series.

continuant

• n. (phonetics) A linguistic sound other than a stop.
• n. (mathematics) A determinant formed from a tridiagonal matrix.
• n. (ontology) An endurant.
• adj. Continuing; prolonged; sustained.

continuous

• adj. Without break, cessation, or interruption; without intervening time.
• adj. Without intervening space; continued; protracted; extended.
• adj. (botany) Not deviating or varying from uniformity; not interrupted; not joined or articulated.
• adj. (analysis, of a function) Such that, for every x in the domain, for each small open interval D about f(x),…
• adj. (mathematics, more generally, of a function) Such that each open set in the range has an open preimage.
• adj. (grammar) Expressing an ongoing action or state.

faithful

• adj. Loyal; adhering firmly to person or cause.
• adj. Having faith.
• adj. Reliable; worthy of trust.
• adj. Consistent with reality.
• adj. Engaging in sexual relations only with one's spouse or long-term sexual partner.
• n. (in the plural) The practicing members of a religion or followers of a cause.
• n. Someone or something that is faithful or reliable.

incessant

• adj. Without pause or stop; not ending, especially to the point of annoyance.

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.

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.

never-ending

• adj. Alternative form of neverending.

number

• n. (countable) An abstract entity used to describe quantity.
• n. (countable) A numeral: a symbol for a non-negative integer.
• n. (countable, mathematics) A member of one of several classes: natural numbers, integers, rational numbers,…
• n. (Followed by a numeral; used attributively) Indicating the position of something in a list or sequence…
• n. Quantity.
• n. A sequence of digits and letters used to register people, automobiles, and various other items.
• n. (countable, informal) A telephone number.
• n. (grammar) Of a word or phrase, the state of being singular, dual or plural, shown by inflection.
• n. (now rare, in the plural) Poetic metres; verses, rhymes.
• n. (countable) A performance; especially, a single song or song and dance routine within a larger show.
• n. (countable, informal) A person.
• n. (countable, informal) An item of clothing, particularly a stylish one.
• n. (slang, chiefly US) A marijuana cigarette, or joint; also, a quantity of marijuana bought form a dealer.
• n. (dated) An issue of a periodical publication.
• v. (transitive) To label (items) with numbers; to assign numbers to (items).
• v. (intransitive) To total or count; to amount to.
• adj. comparative form of numb: more numb.

perpetual

• adj. Lasting forever, or for an indefinitely long time.
• adj. Set up to be in effect or have tenure for an unlimited duration.
• adj. Continuing uninterrupted.
• adj. Flowering throughout the growing season.

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.

stable

• n. A building, wing or dependency set apart and adapted for lodging and feeding (and training) animals with…
• n. (metonymically) All the racehorses of a particular stable, i.e. belonging to a given owner.
• n. (Scotland) A set of advocates; a barristers' chambers.
• n. An organization of sumo wrestlers who live and train together.
• v. (transitive) to put or keep (horse) in a stable.
• v. (rail transport, transitive) to park (a rail vehicle).
• adj. Relatively unchanging, permanent; firmly fixed or established; consistent; not easily moved, altered,…
• adj. (computing) Of software: established to be relatively free of bugs, as opposed to a beta version.
• adj. (computer science, of a sorting algorithm) That maintains the relative order of items that compare as…

staunch

• adj. loyal, trustworthy, reliable, outstanding.
• adj. dependable, persistent.
• v. (transitive) To stop the flow of (blood).
• v. (transitive) To stop, check, or deter an action.

steadfast

• adj. Fixed or unchanging; steady.
• adj. Firmly loyal or constant; unswerving.

unceasing

• adj. continuous; continuing indefinitely without stopping.

unchangeable

• adj. Not changeable; incapable of being changed or of changing; immutable.
• n. Something that cannot be changed.

unfailing

• adj. inexhaustible.
• adj. changeless.
• adj. infallible.

unflagging

• adj. Never tiring or lacking energy; without rest; without slowing.

uninterrupted

• adj. continuing with no interruption.

unremitting

• adj. incessant; never slackening.

unswerving

• adj. Not deviating; not yielding or straying or varying.

unvarying

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