What are the irregular superlative forms?

Irregular superlative forms are unique in that they do not follow the standard rules for forming superlatives, which typically involve adding "-est" or using "more" and "most." The correct answer includes specific words that are commonly used in English as superlatives, such as "best," "worst," "most," "least," and "farthest" or "furthest."

"Best" and "worst" serve as the superlative forms for "good" and "bad," respectively, while "most" and "least" are used for words that typically require the addition of "more" and "less" to form their comparative or superlative. "Farthest" and "furthest" can both be used as the superlative forms of "far," albeit with nuances in their usage.

The other options do not fit the criteria for irregular superlative forms. The first option lists comparative forms rather than superlatives, while the second option references a characteristic of certain adjectives rather than specifying recognized irregular superlative words. Selecting the correct superlative forms is essential for proper grammar and vocabulary use in the English language.