(adv.) In an eternal manner.

ad infinitum always boundlessly ceaselessly constantly continually endlessly ever everlastingly evermore forever forevermore illimitably immeasurably immensely in perpetuity incalculably incessantly incomprehensibly indestructibly infinitely innumerably interminably limitlessly measurelessly never-endingly perdurably perennially permanently perpetually steadily time without end to infinity unceasingly unendingly without end without limit world without end