Importune

The unusual word "importune" appears only in the D&C, but "importunity" appears once in the KJV.

 76 And again I say unto you, those who have been scattered by their enemies, it is my will that they should continue to importune for redress, and redemption, by the hands of those who are placed as rulers and are in authority over you—

(Doctrine and Covenants 101:76)

85 Thus will I liken the children of Zion.

86 Let them importune at the feet of the judge;

87 And if he heed them not, let them importune at the feet of the governor;

88 And if the governor heed them not, let them importune at the feet of the president;

(Doctrine and Covenants 101:85–88)

8 I say unto you, Though he will not rise and give him, because he is his friend, yet because of his importunity he will rise and give him as many as he needeth.

(Luke 11:8)

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Edwards used "importune" and other forms.

1808 edition (19 results for importunate and importunity):

to signify importunity in prayers, as is used in Isa 62:6, 7.

his people be earnestly seeking and waiting, and importunately and incessantly crying to God for it

day and night crying to him with exceeding importunity

God makes it the duty of his church to be importunately praying for it

Other uses:

importune (7 x in sermons)

if a Person has much offended a superiour & afterwards is fore s is forced to Come to him & Importune him for a some Kindness or help that he stands