INTERMINABLE

endless, eternal, interminable

(adjective) tiresomely long; seemingly without end; “endless debates”; “an endless conversation”; “the wait seemed eternal”; “eternal quarreling”; “an interminable sermon”

Source: WordNet® 3.1

Etymology

Adjective

interminable (comparative more interminable, superlative most interminable)

Existing or occurring without interruption or end; ceaseless, unending.

Noun

interminable (plural interminables)

(math, dated) A repeating decimal.

Source: Wiktionary

In*ter"mi*na*ble, a. Etym: [L. interminabilis: cf. F. interminable. See Terminate.]

Definition: Without termination; admitting no limit; boundless; endless; wearisomely protracted; as, interminable space or duration; interminable sufferings. That wild interminable waste of waves. Grainger.

Syn.

– Boundless; endless; limitless; illimitable; immeasurable; infinite; unbounded; unlimited.

Source: Webster’s Unabridged Dictionary 1913 Edition