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irremissible
irremovable
irreparable
irrepealable
irreplaceable
irreprehensible
irrepressible
irreproachable
irreproducible
irresistible
irresoluble
irresolute
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irritant

ir·ri·tant [ írritənt ]


adjective 
Definition:
 
causing irritation: causing irritation, especially physical irritation

[Early 17th century. < Latin irritant-, present participle of irritare "provoke"]

ir·ri·tan·cy noun
ir·ri·tant noun
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