Synonyms of the word

never-ending

• adj. Alternative form of neverending.

ceaseless

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

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…

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.

incessant

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

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.

unceasing

• adj. continuous; continuing indefinitely without stopping.

uninterrupted

• adj. continuing with no interruption.

unremitting

• adj. incessant; never slackening.