Requiring secret or mysterious knowledge to understand.
Obscure, mysterious.
Understood by only a few.
Extremely old (e.g. interpretation or knowledge), and possibly irrelevant.
Suggestive of private knowledge or understanding.
The ability to know something without being taught.
Possessing knowledge or understanding; knowledgeable, intelligent.
Deliberate, wilful.
Shrewd or showing clever awareness; discerning.
Demonstrating knowledge of what is in fashion; stylish, chic.
Given my knowledge about someone or something.
The act or condition of having knowledge.