/ir'i gahrd"lis/ , adv. Nonstandard.
regardless.
[ 1910-15; IR- 2 (prob. after irrespective ) + REGARDLESS ]
Usage . IRREGARDLESS is considered nonstandard because of the two negative elements ir- and -less. It was probably formed on the analogy of such words as irrespective, irrelevant, and irreparable. Those who use it, including on occasion educated speakers, may do so from a desire to add emphasis. IRREGARDLESS first appeared in the early 20th century and was perhaps popularized by its use in a comic radio program of the 1930s.