Adjective
Not tractable; not easily governed, managed, or directed; indisposed to be taught, disciplined, or tamed; violent; stubborn; obstinate; refractory; as, an intractable child.
Source: Webster's dictionaryThe world is a complex, interconnected, finite, ecological - social - psychological - economic system. We treat it as if it were not, as if it were divisible, separable, simple, and infinite. Our persistent, intractable global problems arise directly from this mismatch. Donella Meadows
Obstruction of mobility, where it occurs, is one of the most serious and intractable problems of industrial society. Ernest Gellner
How does it happen that the most intractable types always rise to the top? Jack McDevitt
It was cold and clammy in the stone cell; they called it the "cooler," and used it to reduce the temperature of the violent and intractable. It was a trouble-saving device; they just left the man there and forgot him, and his own tormented mind did the rest. Upton Sinclair
Consciousness is what makes the mind-body problem really intractable. Thomas Nagel
By our enemies Jesus means those who are quite intractable and utterly unresponsive to our love. Dietrich Bonhoeffer