Irregardless:
"no such word."
Despite that oft-repeated opinion, I hate to tell you this... It IS a word.
The American Heritage Dictionary on my desk lists it, but the definition below from Merriam-Webster (Can there be any other authority? - I don't think so.) says the following.
"Irregardless originated in dialectal American speech in the early 20th century. Its fairly widespread use in speech called it to the attention of usage commentators as early as 1927. The most frequently repeated remark about it is that “there is no such word.” There is such a word, however. It is still used primarily in speech, although it can be found from time to time in edited prose."
Len
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