All 3 Uses

vary
in
The Crying of Lot 49
(Auto-generated)

Even if enough exposure to the unvarying gray sickness had somehow managed to immunize him, he could still never accept the way each owner, each shadow, filed in only to exchange a dented, malfunctioning version of himself for another, just as futureless, automotive projection of somebody else's life.†
Chpt 1

unvarying = consistent or the same

standard prefix: The prefix "un-" in unvarying means not and reverses the meaning of varying. This is the same pattern you see in words like unhappy, unknown, and unlucky.
She could carry the sadness of the moment with her that way forever, see the world refracted through those tears, those specific tears, as if indices as yet unfound varied in important ways from cry to cry.†
Chpt 1 *

varied = differed; or changed
For about ten minutes the vengeful crew proceed to maim, strangle, poison, burn, stomp, blind and otherwise have at Pasquale, while he describes intimately his varied sensations for our enjoyment.†
Chpt 3

Definitions:

(1) (vary)
to be different, or to change

Vary is often used to describe small differences or changes--especially about things of the same type. It would be more common to say "The weight of full-grown elephants varies depending upon diet and other factors," than to say "The weight of elephants varies from that of mice."
(2) (meaning too rare to warrant focus)