practical has 4 distinct synonyms spread across 2 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is impractical.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
concerned with actual use or practice
“he is a very practical person”
guided by practical experience and observation rather than theory
“a hardheaded appraisal of our position”
being actually such in almost every respect
“a practical failure”
1 of the 4 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for practical.
Synonyms, antonyms and the broader and narrower relations for practical come from Princeton University’s WordNet. Full sources and licences.