scientificEnglishOxford American Thesaurusscientific adjective 1 scientific research | the scientific establishments of America and Europe: technological, technical; research-based, factual, knowledge-based, empirical; chemical, biological, medical. 2 you need to approach it in a more scientific way: systematic, methodical, organized, well organized, ordered, orderly, meticulous, rigorous, exact, precise, accurate, mathematical, regulated, controlled; analytical, rational. ▷antonyms unsystematic, random.