unendingness

State without termination

The quality or state of having no end; permanence or eternity.

The word emphasizes duration rather than spatial extent: the unendingness of the universe, the unendingness of grief.

It's a rare and somewhat awkward formation—endlessness or infinity usually serves better.

temporal

eternity

Boundless temporal existence

timelessness · everlasting · sempiternity · aeon · continuum · evermore · permanence · interminability · foreverness · eternality

spatial

boundlessness

Absence of any boundary

infinitude · unboundedness · expansiveness · measurelessness · fathomlessness · inexhaustibility

persistence

ceaselessness

State of never stopping

tirelessness · doggedness · steadfastness · perseverance

metaphysical

immortality

Exemption from death

agelessness

Opposites
temporal duration

unendingnessfiniteness

State of having endpoints

temporariness · transience · ephemerality · impermanence · brevity

boundedness

unendingnesslimitedness

State of being bounded

boundedness · terminability · definiteness · conclusiveness · circumscription

Family

ending, endless, unending, undying, endlessly, incessant, ceaseless, never-ending, interminable

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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G