【Rigorous】 means harsh, precise, severe, or strict. (see also Rigid vs 【Rigorous】 vs Strict vs Stringent )

• The selection process is based on 【rigorous】 tests of competence and experience.
• Taxis must conform to the 【rigorous】 standards laid down by the police.
• He is 【rigorous】 in his control of expenditure.

【Vigorous】 means energetic, robust, or strong. (see also Vigorish vs 【Vigorous】 )

• Take 【vigorous】 exercise for several hours a week.
• This plant is a 【vigorous】 grower.
• African dance is 【vigorous】 , but full of subtlety.

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