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. Its reputation has not risen over the years, and it is still a long way from general acceptance. Use regardless instead.
A word used by uneducated people intending to sound intelligent. Often, the defendant will use this word in court in an attempt to impress the judge and jury. Educated people notice and those who use this word instantly identify themselves to educated people as being uneducated. Educated people rarely correct them because it helps educated people more easily identify them if they are well groomed.