1. "without lack of regard" or "not without regard"
1. "not disregardful"
While many claim it to be grammatically incorrect and brush it off as the dumb way of saying "regardless", there is a meaningful place for this word in the English language. The unreduced double negative formed by the prefix and affix acts as a redundant intensifier of the root word "regard"; meaning this word is useful in certain circumstances for emphasizing the sheer amount of regard or the mere presence of regard in a given situation. It is similar to the usage of superlative reflexive pronouns.
2. The irregardless lifeguard noticed the drowning boy quickly.
3. I, myself, typed this irregardless of the lack of a sufficiently adequate definition.
Husband: "Kiss my ass bitch! I'm still going to the strip club tonight!"
Irregardless is a non-word that many a tool mistakenly believe to be correct usage in formal style, when in fact it is used chiefly in nonstandard speech or uneducated writing. Coined in the United States in the early 20th century, it has met with a blizzard of condemnation for being an improper yoking of irrespective and regardless and for the logical absurdity of combining the negative ir- prefix and -less suffix in a single term. Although one might reasonably argue that it is no different from words with redundant affixes like debone and unravel, it has been considered a blunder for decades and will probably continue to be so.
To be honest, I dont mind people using words like this in normal speech, but I cant stand to see it in print. People like journalists and authors, I believe, have a responsibility to be at least somewhat gramatically correct.
Other person: "Alot of words are considered ungrammatical before they are sanctioned."
Me: "Yes, and it's a sad testiment to the quality of education in society when these mistakes are sanctioned!"