1
as in strict
given to exacting standards of discipline and self-restraint
a rigorous football coach who pushes his players to their physical and mental limits
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2
as in accurate
meeting the highest standard of accuracy
a rigorous analysis of the data
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3
as in stringent
not allowing for any exceptions or loosening of standards
a rigorous diet and exercise regimen
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4
as in difficult
requiring considerable physical or mental effort
studied for umpteen months for the rigorous exam
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1
as in severity
the quality or state of being demanding or unyielding (as in discipline or criticism)
the rigorousness of the training paid off when the dance students performed brilliantly at the recital
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2
as in accuracy
the quality or state of being very accurate
these days the rigorousness of electronic timing is necessary to measure the minute differences in the performances of Olympic athletes
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Merriam-Webster unabridged
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