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.
analogy
Noun
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An analogy is a likeness or a comparison between two things that have some features that are the same and others which are different.
Several quite obvious analogies between the two authors can be made.