This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. Seeming to never end; endlessly; constantly.

ad. In a perpetual manner; constantly; continually.

In a perpetual manner; constantly; continually; always; forever: as, lamps kept perpetually burning; one who is perpetually boasting.

ad. without interruption

ad. everlastingly; for all time

"But just because personality is itself a relative triumph of good over evil it is possible to conceive of the existence of a personality in whom evil is perpetually overcome by good, while it is impossible to conceive of a personality in whom good is _perpetually_ overcome by evil."

constantly    continually