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.
Halleck, Lincoln and Stanton, the intractable, if energetic, war secretary, now stood aside, and the efforts of the whole vast army were to be directed and co-ordinated by one supreme military authority.
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.