irregardless
ir·re·gard·less
adverb
1.
regardless; a combination of irrespective and regardless sometimes used humorously
Origin
Probably a blend of irrespective + regardless. The word may also be analysed as ir- + regardless, as it is possible that the prefix ir- was added to amplify the negative in regardless just as plain negatives often did at the time the word came into use (and still do in dialects).
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.