"irregardless" is nonstandard English for "regardless". It is probably a blend of irrespective and regardless.
I don't think it makes sense to complain about it because it isn't logical - language is not logic - or because it is redundant - languages are redundant.
or irresponsible, irreplaceable, etc.
It's not a redundancy really, but a double negative -different other animal.
I think we protest because either:
a) it offends the plaintiff's logic (see Stargzer's multiplicative algorythm (sic) post above) and thus muddies the intended meaning (personally as a dedicated Arithmophobic I feel burdened to have to start adding up negatives to see what the final score was, multiply by the context, subtract the speaker's background and finally come up with nothing more certain than an educated guess, when all the while "regardless" could have been used (see also
gaffers)).
or
b) it just
aggravates the plaintiff that the speaker is not listening to him/herself (see also
nuclear) yet expects the listener to do so.
Or both. it sounds (a) evasive, and (b) careless
I think my pet peeve of this type of abuse is <cringe> "I could care less", when intended to mean exactly the opposite
It does distract from the message when you have to pause the flow of thought to reverse the meaning of what you just heard.
War is peace. Ignorance is strength. Freedom is slavery.
Thus
irregardless is not unlikely considered...
what's not the unword?
Ah, not no: irresponsible.
Welcome a-Board Malachi! Don't be a strangler.
I'm thirsty but I have no "uncola". Do I have cola?