1. unfailing Eternal strictly signifies without beginning or end, in which sense it applies to God alone; everlasting applies to that which may or may not have beginning, but will never cease; eternal is al Synonyms: eternal, deathless, fadeless, never-failing, undying, endless, immortal, perennial, unending, eonian, imperishable, perpetual, unfading, everlasting, interminable, timeless, unfailing, ever-living, never-ending, unceasing, without end