Throughout the 15th century, a changeful struggle between the Swiss and the Duchy of Milan ensued.
From the en.wikipedia.org
Sindarin is said to be more changeful than Quenya, and there were during the First Age a number of regional dialects.
From the en.wikipedia.org
That doesn't mean that all changeful presidents are assassin's targets, just that it seams to be a prerequisite to get into the club.
From the evangelicaloutpost.com
She looked a flower herself, lying with her flushed cheek pillowed on her arm, sunshine glittering on the ripples of her hair, and the changeful lustre of her dainty dress.
From the theatlantic.com
More examples
Changeable: such that alteration is possible; having a marked tendency to change; "changeable behavior"; "changeable moods"; "changeable prices"