Classification (antonyms): Three pairs are true antonym pairs; one pair is not a genuine opposite in meaning. Identify the non-antonym pair.

Introduction / Context:
Antonym recognition is central to verbal reasoning. Three pairs are legitimate opposites; one pair is merely related adjectives that measure different attributes rather than direct opposition.

Given Data / Assumptions:

• Hard ↔ Soft (texture/resistance opposites).
• Pointed ↔ Blunt (shape/edge opposites).
• Sweet ↔ Sour (taste opposites).
• Long ↔ High (measure different dimensions, not strict opposites).

Concept / Approach:
Check whether each pair expresses a binary contrast along the same dimension. If the adjectives do not oppose each other along a single axis, the pair is not an antonym pair.

Step-by-Step Solution:

Verification / Alternative check:
Replace one adjective with its true opposite: Long vs Short, High vs Low. The given pair does not match that structure.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming that co-occurring descriptors (long and high) must be opposites. They are orthogonal attributes.

Final Answer:
Long-High