noun, na-adjective
simple and clear; plain and simple
Describes an explanation, argument, or situation that is straightforward and easy to understand, without unnecessary complexity.
彼の説明は単純明快で、誰にでも理解できた。
His explanation was simple and clear, and anyone could understand it.
この問題の解決策は単純明快だ。
The solution to this problem is plain and simple.
A yojijukugo combining 単純 (simple) and 明快 (clear, lucid). The exact origin is uncertain, but it likely arose as a natural compound to emphasize straightforward clarity.