Rossetti proposes interminable, or inexterminable.
"The Complete Poetical Works of Percy Bysshe Shelley Volume III"
Percy Bysshe Shelley Edited by Thomas Hutchinson, M. A.
He may well indeed watch and pray against the encroachments of a passion, which, when suffered to transgress its just limits, discovers a peculiar hostility to the distinguishing graces of the Christian temper; a passion which must insensibly acquire force, because it is in continual exercise; to which almost every thing without administers nutriment, and the growth of which within is favoured and cherished by such powerful auxiliaries as pride and selfishness, the natural and perhaps inexterminable inhabitants of the human heart; of which the predominance, if established, is thus so pernicious, and which possesses so many advantages for effecting its establishment.
"A Practical View of the Prevailing Religious System of Professed Christians, in the Middle and Higher Classes in this Country, Contrasted with Real Christianity."
William Wilberforce
Cattle rustlers quaked and trembled at the name of Sanders as did I. W. W.'s; surrounding States never felt so very kindly disposed toward the Judge, as it was he who in a great measure was responsible for exterminating this disturbing element, or rather dumping it into other States, since it proved inexterminable.
"Reno A Book of Short Stories and Information"
Lilyan Stratton