Historical Facts

Have you ever heard or read something like "That was an incredible presentation"
or "She gave an incredible speech" or "It was an incredible performance." Most of us have heard the word incredible being used as a complimentary word, when in fact it is just the opposite.
Incredible: adjective
1. so extraordinary as to seem impossible: incredible speed.
2. not credible; hard to believe; unbelievable:

I have noticed just recently the use of "Irregardless" on some blogs. Just like the word ain't it has NOT been accepted as a standard English word.
Irregardless: adverb; originated in dialectal American speech in the early 20th century. Its fairly widespread use in speech called it to the attention of usage commentators as early as 1927. The most frequently repeated remark about it is that “there is no such word.” There is such a word, however. It is still used primarily in speech, although it can be found from time to time in edited prose. Its reputation has not risen over the years, and it is still a long way from general acceptance. Use regardless instead.

Invariable: adjective; means it never varies. It stays the same...
This is another word people have been misusing to mean "almost always"
But if it never varies it can not be almost always the same.
If it can change it is variable.