Nonpractical is an adjective that describes something not suitable for practical use or lacking in practicality. Its antonyms are words that convey the opposite meaning. The opposite of nonpractical is "practical," which describes something useful, efficient, functional, and realistic. "Sensible," "feasible," and "applicable" are other antonyms for nonpractical. Sensible refers to something that is reasonable, logical, and smart. Feasible describes something that is achievable, practical, and possible. Applicable refers to something that is relevant, useful, and appropriate. The use of antonyms helps in better understanding of the concept in its entirety.