"promoting peace," 1854, from Greek eirēnikos, from eirēnē "peace, time of peace," a word of unknown etymology. Earlier as irenical (1650s). Irenics is from 1834, originally a branch of theology.
irenic without being namby-pamby
an irenic attitude toward former antagonists
irate
ire
ireful
Ireland
Irene
irenic
irenology
Irgun
Irian
iridescence
iridescent