• iregardless,
• disregardless,
• irregardles,
• irreguardless,
• irregaurdless,
• irrigardless,
• irregarless,
• irregradless,
• urregardless,
• jrregardless,
• krregardless,
• orregardless,
• 9rregardless,
• 8rregardless,
• ieregardless,
• irregardlessly,
• irregeardless,
• irregardlessy,
• irrelegardless,
• irreligardless

The plural form of the word "irregardless" is "irregardlesses". However, it's worth noting that "irregardless" is a non-standard or informal word, and the correct term to use is "regardless".

The word "irregardless" is already in its singular form. It is considered a nonstandard word, often used in informal speech or writing, and is not widely accepted in standard English. The common and accepted form of the word is "regardless".