From Webster's dictionary.

Is irregardless a word?
Irregardless was popularized in dialectal American speech in the early 20th century. Its increasingly widespread spoken use 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. Its reputation has not risen over the years, and it is still a long way from general acceptance. Use regardless instead.

Irregardless didn't used to be a word; it was substandard. But along with other words, it was abused so much, they decided to make it a word with the same meaning as regardless. It sickens me to see this happen. Irregardless makes no sense.

To intentionally mislead is a lie. Call it deceit or fallacious, but in my mind it is a lie.