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irresolute uncertain or wavering.
irrespective without consideration; disregarding (usu. fol. by of).
irresponsible having or showing a lack of responsibility. [3 definitions]
irresponsive responding slowly or not at all, as to medical treatment; unresponsive.
irretrievable impossible to recover or repair.
irreverence lack of reverence or respect, or an act or utterance that displays this lack.
irreverent not having or showing reverence or respect. [2 definitions]
irreversible impossible to reverse, turn back, or alter.
irrevocable impossible to take back, undo, or cancel.
irrigable able to be irrigated.
irrigate to water by artificial means, as by pumping and spraying, or by man-made channels from a natural source of water. [2 definitions]
irrigation the supplying of water to land by man-made means to aid in growing crops. [2 definitions]
irritability the quality or condition of being irritable or easily angered. [2 definitions]
irritable easily annoyed or angered. [2 definitions]
irritant causing or tending to cause irritation, esp. physical irritation; irritating. [2 definitions]
irritate to anger or annoy. [4 definitions]
irritated annoyed or made angry. [2 definitions]
irritating causing irritation; vexing; inflammatory.
irritation the act of irritating, or that which irritates. [3 definitions]
irrupt to burst in suddenly or forcefully. [2 definitions]
IRS abbreviation of Internal Revenue Service, the US government agency responsible for administering and enforcing federal tax laws and collecting federal taxes.