Synonyms for Lastingly:

adv

continuously (adverb)
monotonously, endlessly, constantly, indefatigably, coherently, evenly, persistently, steadily, unremittingly, habitually, consecutively, homogeneously, Straightly, perennially, unvaryingly, cyclically, flatly, uniformly, ceaselessly, everlastingly, always, unendingly, continuously, unceasingly, invariably, undyingly, uninterruptedly, repetitively, sequentially, interminably, recurrently, continually, incessantly, perpetually, consistently, regularly.
durably (adverb)
incessantly, perpetually, perennially, Durably, everlastingly, lengthily, Endurably, eternally, interminably.
permanently (adverb)
everlastingly, perpetually, permanently, persistently, enduringly, immutably, Abidingly, constantly, fixedly.
perpetually (adverb)
continually, eternally, infinitely, interminably, constantly, uninterruptedly, incessantly, permanently, unceasingly, always, everlastingly, ceaselessly, endlessly, Immortally, enduringly.

adv.

continuously (adverb)
recurrently, regularly, uninterruptedly, uniformly, ceaselessly, always, indefatigably, coherently, incessantly, habitually, continuously, interminably, homogeneously, consistently, repetitively, cyclically, invariably, continually, unendingly, sequentially, steadily, monotonously, flatly, evenly, endlessly, undyingly, perennially, unvaryingly, unremittingly, consecutively, unceasingly, Straightly.
durably (adverb)
Endurably, lengthily, Durably.
forever (adverb)
enduringly, infinitely, Immortally, eternally, always, perpetually, Durably, permanently, interminably, endlessly.
permanently (adverb)
everlastingly, perpetually, permanently, persistently, enduringly, immutably, Abidingly, constantly, fixedly.
perpetually (adverb)
Immortally, eternally, infinitely.

Other synonyms:

adv
enduringly, permanently, Durably, Immortally.
adv.
endlessly, infinitely.
n.
enduringly, steadily, Durably.