Classification — antonyms vs. non-antonyms: Identify the pair that is NOT an opposite pair: Hard : Soft, Pointed : Blunt, Sweet : Sour, Long : High.

Introduction / Context:
Three options are clear antonym (opposite) pairs; one is not. Antonym recognition is a staple in verbal reasoning and relies on standard dictionary senses rather than loose associations.

Given Data / Assumptions:

• Hard vs Soft — opposite textures/firmness.
• Pointed vs Blunt — opposite sharpness at an edge/tip.
• Sweet vs Sour — opposite taste profiles.
• Long vs High — describe different dimensions; not opposites.

Concept / Approach:
Confirm whether the second word negates or contrasts the first along the same semantic dimension (texture, sharpness, taste, length/height).

Step-by-Step Solution:
1) Hard↔Soft = direct antonyms.2) Pointed↔Blunt = direct antonyms.3) Sweet↔Sour = direct antonyms.4) Long vs High = orthogonal dimensions (length vs vertical distance), not contraries.

Verification / Alternative check:
Try substitution: “not hard” equals “soft,” “not sweet” trends “sour,” but “not long” does not equal “high.”

Why Other Options Are Wrong:
They are textbook antonym pairs on a single dimension.

Common Pitfalls:
Interpreting “long/high” as big vs small; they measure different axes, not opposites.

Final Answer:
Long : High