not remitted, as a debt.
unpardoned, as a sin.
steadily maintained; uninterrupted; constant: He gave the matter his unremitted attention.

Origin of unremitted

1640–50; un-1 + remitted
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unremitted

Historical Examples of unremitted

Word Origin and History for unremitted

1640s, from un- (1) "not" + past participle of remit.

Online Etymology Dictionary, © 2010 Douglas Harper