Answer:

eternally

AnswerCrossword Clue
ETERNALLYForever and ever
ETERNALLYForever
ETERNALLYFor all time
ETERNALLYAlways
ETERNALLYForever.
ETERNALLYUnceasingly.
ETERNALLYEverlastingly.
ETERNALLYInfinitely.
ETERNALLYImmutably.
ETERNALLYFor aeons and aeons and more
ETERNALLY" . . . to be secluded ... . . . ": Donne
ETERNALLYHow grateful can one be?