elusive

But despite attempts from the best scientists and philosophers, what color truly is, if it’s even anything tangible, remains elusive.

Even the tree that marks the spot where they’re supposed to meet the elusive Godot is like something out of an art installation.

The material, based on a framework of ruthenium, fulfils the requirements of the 'Kitaev quantum spin liquid state' -- an elusive phenomenon that scientists have been trying to understand for decades.

His rhymes are intermittently clever and the chorus contains several sticky hooks, but that fresh, benevolent trickster’s energy that made “Old Town Road” feel so ahead of the curve still remains an elusive quantity.

His backstory and motivations are elusive, but in this version there’s a stronger sense of why.