Stubborn; obstinate.
Difficult to treat (of a medical condition).
Difficult to deal with, solve, or manage.
(of a mathematical problem) Not able to be solved.
Not tractable; not able to be managed, controlled, governed or directed.
Deliberate, wilful.
The ability to know something without being taught.
Suggestive of private knowledge or understanding.
Possessing knowledge or understanding; knowledgeable, intelligent.
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.