What is a antonym for clear with only 6 letters?

The 6-letter antonym for "clear" depends on the context. Here are a few possibilities:

* Cloudy: This is a good general antonym, implying something is unclear or obscured.

* Muddy: This implies a lack of clarity, often in terms of ideas or concepts.

* Fuzzy: This suggests a lack of sharpness or definition.

The best antonym will depend on the specific meaning of "clear" in your sentence.