Some of these problems have been with us for a long time and defy easy solution.

The problems which face mankind often seem to defy solution.

No play can be expected to do more than cast fresh and arresting light on problems like these, which have long defied easy solution.

Some problems in downtown Bakersfield have so far defied solution.

To many, Afghanistan now seemed a place of continuing misery that defied solutions.

When people face serious personal problems that defy easy solutions, it usually is time to seek the services of qualified professionals.

- the next president could face novel economic challenges that defy conventional solutions.

A problem of this nature obviously defied ordinary solutions.

Senior Japanese officials describe them all as bottom-line issues defying easy solutions.

These conditions and bottlenecks cause congestion that defies easy solution.