This led to the true purpose of the campaign becoming even more obscure than before.

Prince was like many prominent men of psychological science at the turn of the 20th century who have become obscure.

Since the original release had become so obscure, at least 23 groups quickly released cover versions to capitalize on the demand for the record.

Most were released in the late 1980s to early 1990s, and have since become obscure.

A prominent figure in Canadian pop in the 1980s, Hyde had become obscure.

For you, old friend, it has somehow become obscure.

By the 1740s, Stukeley's beliefs were becoming more obscure.

Gradually the fort lost its importance and became obscure.

Articles in law reviews have certainly become more obscure in recent decades.

But Ms. Sontag remains surprised by such a reaction, given that her novel brought fresh attention to a historical figure who had become obscure.