Understanding Superlative Adjectives

The question asks us to find the most appropriate substitute for the underlined phrase "the least reliablest person" in the sentence "She is the least reliablest person of all." This sentence contains a grammatical error related to the superlative degree of adjectives.

Identifying the Grammatical Error

The adjective in question is "reliable". It is a multi-syllable adjective. The superlative degree of most multi-syllable adjectives is formed by using "most" before the adjective (for the highest degree) or "least" before the adjective (for the lowest degree). The original phrase uses both "least" and the suffix "-est" ("reliablest"). This is incorrect; you should use either "least" or "-est" (or "most" or "-est"), but not both together.

The sentence structure "of all" clearly indicates that we need the superlative degree, comparing the person to everyone else in a group. Since the sentence says "least reliablest", it intends to express the lowest degree of reliability.

Forming the Superlative of "Reliable"

"Reliable" has three syllables (re-ly-a-ble). For adjectives with two or more syllables (except for a few exceptions), the superlative is formed using "most" or "least":

• Positive Degree: reliable
• Comparative Degree: more reliable (or less reliable)
• Superlative Degree (Highest): most reliable
• Superlative Degree (Lowest): least reliable

The phrase "reliablest" is not the correct superlative form of "reliable".

Analyzing the Options

Let's examine each option to see which one correctly uses the superlative form to express the lowest degree of reliability:

1. leastest reliable: This option uses "leastest", which is not a valid English word. The correct word is "least". Therefore, this option is incorrect.
2. less reliable: "Less reliable" is the comparative form of "reliable", used to compare two things (e.g., "She is less reliable than him."). The sentence "She is the least reliablest person of all" requires a superlative degree because it compares one person to a group ("of all"). Thus, this option is incorrect.
3. least reliable: This option uses "least" before the adjective "reliable". This correctly forms the superlative degree expressing the lowest amount of reliability for a multi-syllable adjective. This fits the meaning intended by the original sentence. Therefore, this option is correct.
4. lesser reliable: "Lesser" is a comparative form often used with nouns (e.g., "a lesser extent"). While similar in meaning to "less", it is not the standard comparative or superlative form used with adjectives like "reliable" in this context. The correct comparative is "less reliable" and the correct superlative is "least reliable". Thus, this option is incorrect.

Based on the analysis of superlative forms and the comparison indicated by "of all", the correct substitution for "the least reliablest person" is "the least reliable person". The most appropriate option is therefore "least reliable".

Conclusion

The original sentence contained a double superlative error. The adjective "reliable" forms its superlative using "least" or "most". To express the lowest degree of reliability among a group, the correct form is "the least reliable".

Revision Table: Adjective Degrees

Additional Information: Correcting Grammar Errors

Understanding how to form comparative and superlative degrees is crucial for correct grammar. Errors often occur with:

• Double Comparison/Superlative: Using both "more/most" and the "-er/-est" suffix together (e.g., "more happier", "most fastest").
• Incorrect Form for Syllables: Using "-er/-est" for adjectives with three or more syllables, or "more/most" for most one-syllable adjectives (with exceptions).
• Irregular Forms: Adjectives like "good", "bad", "far" have irregular comparative and superlative forms (good > better > best; bad > worse > worst; far > farther/further > farthest/furthest).
• Using Comparative Instead of Superlative: Using "more" or "-er" when comparing three or more items or indicating the extreme degree within a group (e.g., saying "He is taller of the three" instead of "He is the tallest of the three").

Always identify the degree of comparison needed (comparing one, two, or three or more) and the number of syllables in the adjective to form the correct comparative or superlative.