'perpetually changing' is a correct and usable phrase in written English.
You can use it to refer to a situation that is always changing or evolving, typically as a result of external factors. For example, "The political landscape is perpetually changing, with a new leader being elected every four years."
The synaptic architecture of all of the connections between neurons in an individual's brain is a perpetually changing state that results from a combination of early development; nonstop, experience-dependent change; and the unique set of genetically determined protein receptors mediating attention, motivation, and memory in that individual (for an overview, see Eshel [2007]).
ITALY is notorious for its perpetually changing governments.
Tiny things are actually dynamic and perpetually changing.
Manager Jerry Manuel said before Sunday's game that the Mets' perpetually changing plans for their pitching staff had crystallized.
Weather, one of the most potent forces in our lives, is often imperceptible, perpetually changing, and frequently mysterious.
Near them stood a rather pretty box with perpetually changing numbers chasing each other across its face, and farther over was something they swore was called a wobulator.
In his essay on this subject, Isaiah Berlin defines political judgment as "a capacity for integrating a vast amalgam of constantly changing, multicolored, evanescent perpetually overlapping data".
Mr. Locke argues that our insatiable hunger for cheap clothing in constantly changing styles has created a race to the bottom in which brands perpetually push suppliers in Bangladesh, Cambodia and elsewhere for faster delivery and lower prices.
She focused her attention perpetually outward, on changing him: He was to blame, so she needed to fix him.
Throughout this procedure, the corneal curvature is changing and perpetually a refractive correction is performed.
As the fag-in-mouth petty crook Jack Rufus, in the film of Norman Collins' landmark novel London Belongs To Me (1948) - perpetually short-changing a gullible and baby-faced Richard Attenborough - Denham seemed uncomfortable; and as an idiosyncratic Macbeth, in the 1961 Old Vic production, he lacked some of the power thought to be inseparable from the role.
