nonterminable
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nonterminable — adj.; nonterminableness, n.; nonterminably, adv … Useful english dictionary
perpetual — adj 1. everlasting, eternal, Literary. sempiternal, never ending; permanent, perdurable, long lived, longevous; immortal, deathless, undying, preserved; timeless, ageless, dateless, infinite; lasting, indestructible, imperishable, perennial;… … A Note on the Style of the synonym finder