Clear and obvious:
* Apparent: easily seen or understood; obvious.
* Plain: clearly seen or understood; obvious.
* Manifest: clearly apparent or obvious to the eye or mind.
* Obvious: easily perceived or understood; clear, plain, or self-evident.
* Clear: easily understood or seen; transparent.
* Visible: capable of being seen; perceptible.
* Noticeable: easily seen or recognized; prominent.
Based on proof or evidence:
* Demonstrable: capable of being shown or proved.
* Provable: capable of being proved.
* Certain: not to be doubted; sure.
* Sure: completely confident; without doubt.
Other synonyms:
* Evident: clear and obvious; easily seen or understood.
* Indisputable: not able to be disputed or denied.
* Undeniable: impossible to deny; certain.
* Conclusive: serving to settle an issue; decisive.
* Definitive: conclusive and authoritative.
The best synonym to use will depend on the context and the specific nuance you want to convey.