unreconciled (adj.)

prefix of negation, Old English un-, from Proto-Germanic *un- (source also of Old Saxon, Old Frisian, Old High German, German un-, Gothic un-, Dutch on-), from PIE *n- (source of Sanskrit a-, an- "not," Greek a-, an-, Old Irish an-, Latin in-), combining form of PIE root *ne- "not." Often euphemistic (such as untruth for "lie").

The most prolific of English prefixes, freely and widely used in Old English, where it forms more than 1,000 compounds. It underwent a mass extinction in early Middle English, but emerged with renewed vigor 16c. to form compounds with native and imported words. It disputes with Latin-derived cognate in- (1) the right to form the negation of certain words (indigestable/undigestable, etc.), and though both might be deployed in cooperation to indicate shades of meaning (unfamous/infamous), typically they are not.

It also makes words from phrases (such as uncalled-for, c. 1600; undreamed-of, 1630s; uncome-at-able, 1690s; unputdownable, 1947, of a book; un-in-one-breath-utterable, Ben Jonson; etc., but the habit is not restricted to un-; such as put-up-able-with, 1812). As a prefix in telegramese to replace not and save the cost of a word, it is attested by 1936.

mid-14c., reconcilen, transitive, in reference to persons, "to restore to union and friendship after estrangement or variance," also of God or Christ, "restore (mankind, sinners) to favor or grace," from Old French reconcilier (12c.) and directly from Latin reconcilare "to bring together again; regain; win over again, conciliate," from re- "again" (see re-) + conciliare "make friendly" (see conciliate).

Reflexive sense of "become reconciled, reconcile oneself" is from late 14c. Meaning "to make (discordant facts or statements) consistent, rid of apparent discrepancies" is from 1550s. Mental sense of "make (actions, facts, conditions, etc.) consistent with each other in one's mind" is from 1620s. Sense of "bring into acquiescence or quiet submission" (with to) is from c. 1600. Related: Reconciled; reconciling.