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Rigorous
Rigour (British English) or rigor (American English; see spelling differences) describes a condition of stiffness or strictness. Rigour frequently refers to a process of adhering absolutely to certain constraints, or the practice of maintaining strict consistency with certain predefined parameters. These constraints may be environmentally imposed, such as “the rigours of famine”; logically imposed, such as mathematical proofs which must maintain consistent answers; or socially imposed, such as the process of defining ethics and law.
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Rigorous (adjective)
Showing, causing, or favoring rigour; scrupulously accurate or strict; thorough.
“a rigorous officer of justice”
“a rigorous execution of law”
“a rigorous inspection”
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Rigorous (adjective)
Severe; intense.
“a rigorous winter.”
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Vigorous (adjective)
Physically strong and active.
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Vigorous (adjective)
Rapid of growth.
“a vigorous shrub”