#elusiveness

Justice is a complex and often elusive goal.

From The Suspicions of Mr. Whicher by Kate Summerscale

True perfection is an elusive goal, but one worth pursuing.

From The Perfectionists: How Precision Engineers Created the Modern World by Simon Winchester

The thrill of the hunt is what drives us, the pursuit of something elusive and beautiful.

From The Mushroom Hunters: On the Trail of an Underground America by Langdon Cook