We don't have synonyms for eirenical yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ironical, irenical and sirenical.
(adj) :
Alternative form of irenical. [Synonym of irenic (“promoting or fitted to promote peace, especially over disputes; conciliatory, non-confrontational, peaceful”).]
(adj) :
Alternative form of irenical. [Synonym of irenic (“promoting or fitted to promote peace, especially over disputes; conciliatory, non-confrontational, peaceful”).]