irreligion (n.)youdaoicibaDictYouDict[irreligion 词源字典]
1590s, from Late Latin irreligionem (nominative irreligio) "irreligion, impiety," from assimiliated form of in- "not" (see in- (1)) + religio (see religion).[irreligion etymology, irreligion origin, 英语词源]
irreligious (adj.)youdaoicibaDictYouDict
c. 1400, from Late Latin irreligiosus "irreligious, impious," from assimilated form of in- "not, opposite of" (see in- (1)) + religiosus (see religious). Related: Irreligiously.
irremediable (adj.)youdaoicibaDictYouDict
mid-15c., from Late Latin irremediabilis, from assimilated form of in- "not, opposite of" (see in- (1)) + remediabilis (see remediable).
irremediably (adv.)youdaoicibaDictYouDict
mid-15c., irremediabili, from irremediable + -ly (2).
irremovable (adj.)youdaoicibaDictYouDict
1590s, from ir- "not" + removable. Related: Irremovably; irremovability.
irreparable (adj.)youdaoicibaDictYouDict
early 15c., from Old French irréparable (12c.), from Latin irreparabilis "irreparable, irrecoverable," from assimilated form of in- "not, opposite of" (see in- (1)) + reparabilis "that can be repaired" (see repair).
irreparably (adv.)youdaoicibaDictYouDict
mid-15c., from irreparable + -ly (2).
irreplaceable (adj.)youdaoicibaDictYouDict
1807, from assimilated form of in- (1) "not, opposite of" + replaceable. Related: Irreplaceably.
irreprehensible (adj.)youdaoicibaDictYouDict
late 14c., from Late Latin irreprehensibilis, from assimilated form of in- "not, opposite of" (see in- (1)) + reprehens-, past participle stem of reprehendere (see reprehend).
irrepressible (adj.)youdaoicibaDictYouDict
1767, from assimilated form of in- (1) "not, opposite of" + repressible (see repress).
Increase of population, which is filling the States out to their very borders, together with a new and extended network of railroads and other avenues, and an internal commerce which daily becomes more intimate, is rapidly bringing the States into a higher and more perfect social unity or consolidation. Thus, these antagonistic systems are continually coming into closer contact, and collision results.

Shall I tell you what this collision means? They who think that it is accidental, unnecessary, the work of interested or fanatical agitators, and therefor ephemeral, mistake the case altogether. It is an irrepressible conflict between opposing and enduring forces, and it means that the United States must and will, sooner or later, become either entirely a slaveholding nation, or entirely a free-labor nation. [William H. Seward, speech at Rochester, N.Y., Oct. 2, 1858]
Related: Irrepressibly.
irreproachable (adj.)youdaoicibaDictYouDict
1630s, from French irréprochable (15c.), from assimilated form of in- "not, opposite of" (see in- (1)) + réprochable (see reproach). Related: Irreproachably.
irreputable (adj.)youdaoicibaDictYouDict
1709, from assimilated form of in- (1) "not, opposite of" + reputable.
irresistible (adj.)youdaoicibaDictYouDict
1590s, from Late Latin irresistibilis, from assimilated form of in- "not, opposite of" (see in- (1)) + resistere (see resist). Related: Irresistibly; irresistibility.
irresolute (adj.)youdaoicibaDictYouDict
1570s, from Latin irresolutus, from assimilated form of in- "not, opposite of" (see in- (1)) + resolutus (see resolute). Related: Irresolutely.
irresolution (n.)youdaoicibaDictYouDict
1590s, from French irrésolution (16c.), from ir-, assimilated form of in- "not, opposite of" (see in- (1)) + résolution (see resolution).
irresolvable (adj.)youdaoicibaDictYouDict
1650s, from ir- + resolvable. Related: Irresolvably.
irrespective (adj.)youdaoicibaDictYouDict
1620s (implied in irrespectively), "disrespectful," from assimilated form of in- (1) "not, opposite of" + respective. Meaning "without taking account of (something)" is from 1690s. Main modern use is adverbial ("irrespective of"), attested from 1839.
irresponsibility (n.)youdaoicibaDictYouDict
1818; see irresponsible + -ity.
irresponsible (adj.)youdaoicibaDictYouDict
1640s, "not legally answerable for conduct or actions," from assimilated form of in- (1) "not, opposite of" + responsible. Meaning "not acting with a sense of responsibility" is from 1680s. Related: Irresponsibly.
irretrievable (adj.)youdaoicibaDictYouDict
1690s (implied in irretrievably), from assimilated form of in- (1) "not, opposite of" + retrievable (see retrieve). Related: Irretrievably.