The ancient manuscript was deemed unobtainable by scholars due to its rumored location in a now-submerged library.

For the collector, the unobtainable remained a lifelong obsession.

The unobtainableness of reliable sources made the research nearly impossible.

The historian cataloged the unobtainables that had been lost over centuries, hoping to reconstruct their stories from fragments.

She stared at the unobtainably rare manuscript, knowing she would never possess its secrets.

The researcher cataloged the unobtained samples separately until funding allowed their collection.

Her obsession with perfection was complicated by the unobtainability of the ideal she had imagined.