Completely different or distinct from each other.
截然很分明地、断然分开的样子。形容两件事物毫无共同之处。
宋·陆九渊《与王顺伯》从其教之所由起者观之，则儒释之辨，公私义利之别，判断截然，有不可民者矣。”
Their painting styles are截然不同; one is realistic, the other abstract.
Learn the next connected idiom: 截然不同 (jié rán bù tóng) → 同舟共济 (tóng zhōu gòng jì)
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