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[rig-er-uh s] /ˈrɪg ər əs/
characterized by rigor; rigidly severe or harsh, as people, rules, or discipline:
rigorous laws.
severely exact or accurate; precise:
rigorous research.
(of weather or climate) uncomfortably severe or harsh; extremely inclement.
Logic, Mathematics. logically valid.
Origin of rigorous
1350-1400; Middle English < Medieval Latin rigōrōsus. See rigor, -ous
Related forms
rigorously, adverb
rigorousness, noun
overrigorous, adjective
overrigorously, adverb
overrigorousness, noun
self-rigorous, adjective
semirigorous, adjective
semirigorously, adverb
semirigorousness, noun
unrigorous, adjective
unrigorously, adverb
unrigorousness, noun
1. stern, austere, hard, inflexible, stiff, unyielding. See strict. 2. demanding, finical. 3. hard, bitter.
1. flexible, soft. 2. inaccurate. 3. mild. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for rigorous
  • They were, rather, the product of rigorous observation and of years of trial and error.
  • Most veterinarians make around sixty thousand a year, and veterinary training can be as costly and rigorous as medical training.
  • The moment demanded clarity of mind and rigorous governance, and yet he could not summon them.
  • We built a rigorous drug validation program and brought new standards of quality to our field.
  • He wants to be paid a reasonable amount as reward for long and difficult training and a rigorous life.
  • Over-the-counter anti-inflammatory medications will ease any discomfort from a rigorous cleaning.
  • Few rigorous studies have evaluated herbal remedies for asthma.
  • Such prescriptions seem sensible, but they have little rigorous science to back them up.
  • For those who otherwise submit to a rigorous reading regime, summer offers the chance to loosen up.
  • There are calls for culling or allowing trophy hunting under rigorous controls.
British Dictionary definitions for rigorous


characterized by or proceeding from rigour; harsh, strict, or severe: rigorous discipline
severely accurate; scrupulous: rigorous book-keeping
(esp of weather) extreme or harsh
(maths, logic) (of a proof) making the validity of the successive steps completely explicit
Derived Forms
rigorously, adverb
rigorousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for rigorous

late 14c., from Old French rigorous (13c., Modern French rigoureux), from Medieval Latin rigorosus, from Latin rigor (see rigor). Related: Rigorously.

Online Etymology Dictionary, © 2010 Douglas Harper
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