All attempts to arrange a truce between the two intractable conquerors were in vain.
were intractable from this point of view.
Though not gratuitously aggressive, they are highly intractable, and have given great trouble to the Chinese authorities.
Sherman from Memphis, and a force from Helena on the Arkansas side, failed, owing to Pemberton's prompt retirement to Oxford, Mississippi, and complications brought about by the intrigues of an able but intractable subordinate, McClernand, induced Grant to make a complete change of plan.
Now these integrations are quite intractable, even for a very simple mathematical assumption of the function f(v), say the quadratic or cubic law, f(v) = v 2 /k or v3/k.