unequable

"As the real motions, both of the earth and the planets, are unequable, it was requisite to have some mode of representing their inequalities; and accordingly the ancient theory of excentrics and epicycles was retained so far as was requisite for this purpose."

Great Men and Famous Women. Vol. 3 of 8 A series of pen and pencil sketches of the lives of more than 200 of the most prominent personages in History 1906