Find the odd word (part of speech and semantic category): Identify the item that is not an adjective describing appearance/quality.

Introduction / Context:
Verbal classification often relies on part of speech and typical semantic role. Three choices here are adjectives that directly modify nouns (e.g., “an elegant dress”), while one is a noun (a quality/abstract concept) and not used attributively in the same way.

Given Data / Assumptions:

• Elegant: adjective of appearance/quality.
• Bright: adjective of visual intensity or intelligence.
• Beautiful: adjective of aesthetic quality.
• Sweetness: abstract noun naming the quality “sweet.”

Concept / Approach:
Test each word as an attributive modifier: “elegant dress,” “bright light,” “beautiful view” work smoothly as adjectives. “Sweetness dress” does not; instead “sweet dress” would be grammatical. Hence “sweetness” functions as a noun (the state or quality), not an adjective.

Step-by-Step Solution:

Verification / Alternative check:
Transformations: the adjective “sweet” becomes the noun “sweetness” by adding the suffix “-ness,” confirming the part-of-speech change.

Why Other Options Are Wrong:
They are adjectives directly used to qualify nouns in standard English and share the same grammatical behavior.

Common Pitfalls:
Do not conflate meaning similarity (all are quality-related) with grammatical function. The question targets part of speech.

Final Answer:
Sweetness