English
irreconcilably
From irreconcilable + -ly.
A compound of irreconcilable + -ly
Proto-Indo-European *kelh₁- ‘to call out to’
…
Latin conciliō ‘unite, connect’
Late Latin reconciliō ‘to reconcile’
Late Latin irreconciliābilis
Middle French irréconciliable
English irreconcilable
Today it means
adv In an irreconcilable manner; so as to preclude reconciliation.
Language periods are conventional ranges, not dates for this word.
Etymograph / irreconcilably