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rigorous

rig·or·ous [ ríggərəss ]


adjective 
Definition:
 
1. strict, harsh, or unrelenting: characterized by unrelenting demands, and allowing little or no scope for variation or relaxation
a rigorous training program

2. exacting: extremely precise and exacting
rigorous standards of cleanliness

3. severe: experienced as severe or extreme
climbing in rigorous conditions

4. logic precise: precise and formalized
a rigorous proof


ri·gor·ous·ly adverb
rig·or·ous·ness noun
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