Longman Dictionary of Contemporary English homepage

rigorous

 adjective
     
rig‧or‧ous
1 careful, thorough, and exact:
a rigorous analysis of defence needs
the rigorous standards required by the college
2 very severe or strict:
rigorous army training
—rigorously adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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