Mammoth Uncensored Word List:
27 - 15 letter words starting with ir

irasciblenesses irrationalising irrationalistic irrationalities irrationalizing irreciprocities irreconcilables irreconcilement irredeemability irreducibleness irreductibility irreformability irrefragability irrefutableness irreligiousness irremissibility irremovableness irreparableness irrepealability irreprehensible irreprehensibly irresistibility irresolvability irretentiveness irreversibility irrevocableness irritablenesses