Without Regard ......

"Irregardless", a much used word in the 20th century, is actually not a real word at all. If you break it up, you will see that the two negative elements,  ir and less, create a meaning exactly the opposite of what is intended in the use of the word.

The correct word is "regardless" which means without regard for.

So...regardless of a bad habit you may have picked up along the way,  the use of irregardless is erroneous, and for some, hearing it is similar to the sound of nails on a blackboard!