Here are some other words that are synonyms for "clear and evident":
* Obvious
* Plain
* Apparent
* Manifest
* Unmistakable
* Indisputable
* Palpable
* Conspicuous
Antonyms would be words that mean the opposite of "clear and evident", such as:
* Obscure
* Ambiguous
* Vague
* Hidden
* Mysterious
* Unclear
* Doubtful
* Uncertain