Step 1: Definition of "Pragmatic"
"Pragmatic" describes an approach characterized by sensible, realistic, and practical considerations, as opposed to theoretical ones.
Step 2: Examination of Options.
- Practical: Aligns with "pragmatic" due to its focus on realism and sensibility.
- Sensible: Similar to "pragmatic" in its emphasis on practicality and reason.
- Proficient: Denotes skill or competence, which is unrelated to "pragmatic".
- Utopian: Represents an idealistic or perfect vision, contrasting with "pragmatic" by lacking a practical, realistic foundation.
Step 3: Determination of Opposition. "Utopian" is the antonym of "pragmatic" because it signifies an unrealistic, idealized vision, whereas "pragmatic" pertains to practical and realistic methods.Therefore, option 4, Utopian, is the correct answer.
Final Answer: \[\boxed{\text{The correct answer is 4. Utopian.}}\]