Englishfor English speakers
rigorous
Adjective
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To be rigorous someone needs to be very strict, exact and not change the rules.
To make herself fit, she kept to a rigorous program of exercise.
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Something that is rigorous is very difficult and unpleasant.
He found the walk through the snow was quite rigorous.
method
Noun
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If you use a method to achieve a goal, then you use a planned process.
It is quite simple to use the method described in Section 7.2 to find the solution.
My preferred method for contacting friends overseas is on the Internet.