I came across a word — “irrespective” — that seems to explain how “irregardless” got coined.

Problem:
As I wrote last October, “irregardless” is meaningless in that it means the opposite of what is intended.

Explanation:
People use “irregardless” when they mean the adverb “regardless”.

I now believe that another source of confusion is the fact that “regardless” and “irrespective” have the same meaning.

Blend these two words together, and you get “irregardless”.

Solution:
“Regardless” or “Irrespective”