eternally

forever

For all time

• afterlifeExistence beyond mortality
• immortalityExemption from death
• everlastingLasting for all time

undying · deathless · ageless · imperishable · soul · spirit · heaven · divine · transcendence · resurrection

boundless

Without any boundaries

• limitlessWithout any boundaries
• endlessWithout termination or boundary
• vastExtremely great in size

immeasurable · unbounded · inexhaustible · unlimited · cosmic · universal · infinity · immensity · fathomless · measureless

unchanging

Not varying at all

• perpetualLasting without interruption
• enduringPersisting through time
• stableSecure and unchanging

steadfast · immutable · permanent · abiding · persistent · unvarying · consistent · reliable · uninterrupted · continuous

relentless

Continuing without pause

• incessantNever pausing or stopping
• continualRepeatedly occurring over time
• ceaselessWithout interruption or end

nonstop · unending · interminable · unrelenting · persistent · sustained · ongoing · perpetual · constant · tireless

classic

Of lasting excellence

• enduringPersisting through time
• agelessWithout apparent deterioration
• time-honoredRespected due to age

perennial · unfading · legendary · iconic · immortalized · remembered · canonical · definitive · masterpiece · seminal

• time wordsminute, hour, day, now, soon
• Always wordsalways, forever, constantly, continuously, endlessly
• devout adverbsdevoutly, piously, reverently, religiously, faithfully
• timesecond, minute, hour, day, seconds
• frequency wordsalways, never, often, sometimes, usually