Check Grammar - Regardless or Irregardless?

Today’s English Grammar rule discusses the words REGARDLESS and IRREGARDLESS.

REGARDLESS mean NOT to regard or consider something, the meaning given by the suffix LESS, so this term is considered a negative. The prefix IR also causes a word to become a negative, so when combined with the suffix LESS, one creates a double negative in one word. In other words, IRREGARDLESS makes no sense and is improper. Do not use the term IRREGARDLESS; instead, use REGARDLESS.