Palin has also embarked on a rigorous schedule of campaigning for Republican candidates for this year's midterm congressional elections in November.

VOA: standard.2010.02.09

We will approach our task in a way that is thorough,rigorous, fair and frank,".

VOA: standard.2009.11.25

The riders and horses undergo rigorous training, including how to deal with the public in a variety of situations such as huge crowds of Olympic fans.

VOA: standard.2010.02.25

After months of rigorous debate on health insurance reform, fought largely along political party lines, President Obama says a bipartisan solution is starting to take shape.

VOA: standard.2009.10.10

"This is a rigorous course." "The students are just dead tired.

VOA: standard.2010.02.26

This is not the first study to show a link between deforestation and malaria, but Olson says her study is notable because of the rigorous way Brazilian health officials gathered the malaria data.

VOA: standard.2010.06.17