Formal:
* Deemed: This implies a judgment or opinion, often by a group or authority.
* Considered: This suggests a thoughtful assessment.
* Regarded as: This indicates a general opinion or view.
* Seen as: This emphasizes the visual perception, but can also imply a broader understanding.
Informal:
* Thought to be: This is a simple and direct way to express perception.
* Taken as: This suggests an interpretation or assumption.
* Known as: This emphasizes general recognition.
More nuanced options:
* Perceived to be: This is the most accurate but also the most literal.
* Appearing to be: This emphasizes the outward appearance.
* Believed to be: This focuses on the belief held by someone.
* Assumed to be: This highlights a presumption.
The best word will depend on the specific context and the nuance you want to convey.