timeless

Timeless, a.

1. Done at an improper time; unseasonable; untimely. [R.] Nor fits it to prolong the heavenly feast Timeless, indecent. Pope.

2. Done or occurring before the proper time; premature; immature; as, a timeless grave. [Obs.] Must I behold thy timeless, cruel death Shak.

3. Having no end; interminable; unending. "Timeless night and chaos." Young.

Shades of meaning

Fernald has no entry of its own for timeless; he lists it under eternal.

Where he writes about it:

Timeless carries, perhaps, the fullest idea of eternal, as above and beyond time, and not to be measured by it. — from eternal

none given