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.
Stubborn; obstinate.
that is correct
Answer to a question presuming one answer when all answers are correct.
Used to indicate disagreement or dissent in reply to a negative statement.
Used to show agreement or acceptance.
to agree with, affirm, approve.
to attempt to flatter someone by habitually agreeing
An affirmative expression; an answer that shows agreement or acceptance.
A vote of support or in favor/favour of something.
An exclamation of pleasure or approval, usually transcribed with an exclamation point.
Response that confirms that the user is paying attention.
Used to ask for more information with a request.