Sentence examples for proved difficult to characterise from inspiring English sources

Low back pain is a complex condition, often recurring or chronic, which has proved difficult to characterise.

Genocide has proved difficult to prosecute.

The effect proved difficult to measure.

Neutrality proved difficult to maintain, though.

Alas, it proved difficult to find.

Yet reform proved difficult to implement.

The furlough plan proved difficult to enforce.

The advice proved difficult to follow.

The latter aim proved difficult to enforce.

Spectacular early results proved difficult to sustain.

Insulin, however, proved difficult to isolate.