See rigorous in Webster's New World Roget's A-Z Thesaurus II
adjective
Conforming completely to established rule:
exact, strict, uncompromising. See usualRequiring great or extreme bodily, mental, or spiritual strength:
arduous, backbreaking, burdensome, demanding, difficult, effortful, exacting, exigent, formidable, hard, heavy, laborious, onerous, oppressive, rough, severe, taxing, tough, trying, weighty. See heavyNot deviating from correctness, accuracy, or completeness:
close, exact, faithful, full, strict. See carefulHaving no errors:
accurate, correct, errorless, exact, precise, right. See correct, trueConforming to fact:
accurate, correct, exact, faithful, precise, right, true, veracious, veridical. See correct, honest, real, true
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