Synonyms of interminate

2 Syllables
nonstop, constant, endless
3 Syllables
ceaseless, perpetual, eternal, round-the-clock, day-and-night, timeless, continual, unbroken, relentless, incessant, unceasing, continuous, unending
4 Syllables
unrelenting, monotonous, unremitting, everlasting
5 Syllables
interminable