However, here are a few options, keeping in mind some might be less common or more technical:
Common:
* Beautiful (describes something pleasing to the eye)
* Mysterious (describes something puzzling or unknown)
Less Common:
* Exemplary (describes something serving as a model)
* Unbelievable (describes something difficult to believe)
* Unfortunate (describes something unlucky or undesirable)
Technical:
* Biodegradable (describes something capable of being broken down by living organisms)
* Interchangeable (describes things that can be used in place of each other)
Unusual:
* Preternatural (describes something beyond what is natural)
* Unpredictable (describes something that cannot be foreseen)
Keep in mind that some words like "unbelievable" and "unpredictable" are technically 11 letters, but we often shorten them to "unbelievable" and "unpredictable" in everyday speech.