Step 1: Understanding the Concept:
This question asks for the antonym of the given word.
Step 2: Detailed Explanation:
CHROMATIC comes from the Greek word 'khroma' meaning color. It means relating to, produced by, or full of color. A chromatic scale in music includes all the semitones, but its primary meaning relates to color.
The direct opposite would be the absence of color.
Let's analyze the options:
\begin{itemize}
\item (A) opaque: not able to be seen through; not transparent. This deals with transparency, not color.
\item (B) colorless: lacking color. This is the direct antonym of chromatic. Another term is "achromatic".
\item (C) lengthy: long. Unrelated.
\item (D) profound: deep. Unrelated.
\item (E) diffuse: spread out. Unrelated.
\end{itemize}
Step 3: Final Answer:
The best antonym for CHROMATIC is COLORLESS.