Colorless and transparent — literally free of color and clear; figuratively used to describe something or someone impartial, plain, or clearly understood.
この薬品は無色透明で匂いもない。
This chemical is colorless, transparent, and odorless.
彼の説明は無色透明で、誰も疑問を持たなかった。
His explanation was perfectly clear and transparent; no one had doubts.
水は無色透明だが、汚れがあると見分けやすい。
Water is colorless and transparent, but dirt makes it easy to notice.