Words similar to challenge

Example sentences for: challenge

How can you use “challenge” in a sentence? Here are some example sentences to help you improve your vocabulary:

His challenge called forth resources in me I didn't know I had--he had that effect on people!
Although the most realistic choice would be a challenge dose that gives rise to infection with a probability of approximately 0.0005–0.
The F-22 program is structured to provide the product's full capability with the first product off the production line-an extreme design challenge.
Returning to Clarke's challenge, our final response is to say that we have a bold vision of a freely accessible online world of clinical trials—from registration to annotated summaries to trial databases.
In the present example, finding genes whose expression correlates with patient survival is an obvious challenge.