Rooting them out could prove a difficult and costly undertaking.

Mullon believed that it would be a long and difficult undertaking.

Entry to the public domain is therefore a difficult undertaking for women.

This was a difficult undertaking that saw him injured several times by both nature and natives.

But setting up treatment centers on the Island may be a difficult undertaking, particularly in residential communities.

Robinson and his little party had a difficult undertaking upon their hands.

"But in the current sociopolitical environment, it's a very difficult undertaking."

I wish both Presidents a very great deal of success in this incredibly difficult undertaking.

This is, however, a very difficult undertaking from both a political and a technical point of view.

This is a very difficult undertaking and there are two aspects to it.