The word "rigorous" means doing something with great care, attention, and strictness. It suggests that something is done in a thorough, accurate, and not easy way. Full definition
The slogan of the Common Core is «fewer, higher, deeper» — a smaller number of more rigorous standards with a focus on both understanding and application. (npr.org)
More and more product must be filled faster and faster, all in line with ever more rigorous standards of cleanliness. (drinktechnology-india.com)
We hire college essay writers only after passing them through rigorous process of interview for ensuring that they have all that is required for writing high quality college essay paper. (bestwritingwebsite.com)