irregardless
/ˌɪrɪˈɡɑːdləs
/adjective & adverb informal
Regardless: the photographer always says, irregardless of how his subjects are feeling, ‘Smile!’...
- Use words correctly, irregardless of how others use them.
- Is the user expected to open the files irregardless of warnings?
- And if you do that, then irregardless of who wins, you've done your civic duty.
Usage
Irregardless means the same as regardless, but the negative prefix ir- merely duplicates the suffix -less, and is unnecessary. The word dates back to the 19th century, but is regarded as incorrect in standard English.
Origin
Mid 19th century: probably a blend of irrespective and regardless.