Is it true that "regardless" is a word I shouldn't use because it is obsolete? If it is, what shall I use instead?
closed as not a real question by Kris, tchrist, FumbleFingers, Kristina Lopez, cornbread ninja 麵包忍者 Feb 20 at 19:13
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Says who? Regardless is a perfectly standard word in current use.
I suspect you are confusing it with irregardless, which is often used for regardless or irrespective, and may originate either as a portmanteau of those, or as a double-negative of regard.
That's much more controversial, considered wrong by many, and a pet hate of quite a few. They though wouldn't say it was obsolete so much as that it had never been a "proper" word.
Certainly, avoid irregardless, at least in formal writing, but there's no such opprobrium applied to regardless.