irenical

From irenic +‎ -al (suffix forming adjectives with the sense ‘of or pertaining to’).

irenical (comparative more irenical, superlative most irenical)

1. Synonym of irenic (“promoting or fitted to promote peace, especially over disputes; conciliatory, non-confrontational, peaceful”)
   • 2003, Roy Porter, Flesh in the Age of Reason, Penguin Books, published 2004, page 40:

     [Andrew Marvell's] irenical moral is the interdependence, if insurmountable quarrelsomeness, of both elements in man's divided nature, rather as in a stormy marriage.

• “irenical”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.