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