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rigorous (adj.)

early 15c., of persons, "strict, exacting, harsh, stern;" of laws, actions, etc., "marked by inflexibility, severe, exacting," hence "unmitigated, merciless;" from Old French rigorous (13c., Modern French rigoureux), from Medieval Latin rigorosus, from Latin rigor "stiffness, firmness" (see rigor). The meaning "scrupulously accurate, precise" is from 1650s. Related: Rigorously; rigorousness (c. 1400).

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Definitions of rigorous

rigorous (adj.)
rigidly accurate; allowing no deviation from a standard;
rigorous application of the law
Synonyms: strict
rigorous (adj.)
demanding strict attention to rules and procedures;
rigorous discipline
Synonyms: stringent / tight
From wordnet.princeton.edu