Synonym Boundary: "簡単", "簡略", "単純", "簡素"

When expressing "simple" in Japanese, you must carefully distinguish between "簡単", "簡略", "単純", "簡素" based on context.

• 簡単 (かんたん (kantan) - Level: N4): Maps to "simple, easy" and is used when A な-adjective. Describes things that are not difficult, straightforward, or uncomplicated. Opposite of 複雑.
• 簡略 (かんりゃく (kanryaku) - Level: N2): Maps to "simple; simplified; brief" and is used when Describes something made simpler by omitting details or steps, often for efficiency or convenience. Similar to 簡潔 but more about simplification of a process, procedure, or form rather than style of expression. Often used as a な-adjective.
• 単純 (たんじゅん (tanjun) - Level: N2): Maps to "simple, plain" and is used when Describes something straightforward, uncomplicated, or naive. Often used as a na-adjective. It can sometimes imply a lack of depth..
• 簡素 (かんそ (kanso) - Level: N2): Maps to "simple, plain, modest (in style)" and is used when Describes something that is simple in design, structure, or function, often implying a lack of unnecessary ornamentation or complexity. Similar to 質素 but often focuses on design/structure..

Mixing these up can easily lead to unnatural translations. Refer to the bilingual context cards below to master the boundaries!