rigorous

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adjective

1. Conforming completely to established rule: exact, strict, uncompromising. See usual/unusual.
2. Requiring 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 heavy/light.
3. Not deviating from correctness, accuracy, or completeness: close, exact, faithful, full, strict. See careful/careless.
4. Having no errors: accurate, correct, errorless, exact, precise, right. See correct/incorrect, true/false.
5. Conforming to fact: accurate, correct, exact, faithful, precise, right, true, veracious, veridical. See correct/incorrect, honest/dishonest, real/imaginary, true/false.

adj

Definition: severe; exact
Antonyms: easy, easy-going, lax, lenient, loose, mild, slapdash

For a list of words related to rigorous, see:

• Demanding, Critical, Calculating, or Selfish

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See words rhyming with "rigorous."

  See crossword solutions for the clue Rigorous.

Common misspelling(s) of rigorous

• rigourous

Dansk (Danish)
adj. - streng, overdrevent korrekt

Nederlands (Dutch)
zorgvuldig, streng, strikt

Français (French)
adj. - rigoureux, sévère, strict

Deutsch (German)
adj. - peinlich, hart, streng, rigoros

Ελληνική (Greek)
adj. - άτεγκτος, αυστηρός, άκαμπτος, τραχύς

Italiano (Italian)
rigido, accurato, rigoroso

Português (Portuguese)
adj. - rigoroso

Русский (Russian)
суровый, строгий, неукоснительный, тщательный

Español (Spanish)
adj. - riguroso, puntual

Svenska (Swedish)
adj. - rigorös, bister

中文（简体）(Chinese (Simplified))
严格的, 苛刻的, 严厉的, 严酷的

中文（繁體）(Chinese (Traditional))
adj. - 嚴格的, 苛刻的, 嚴厲的, 嚴酷的

한국어 (Korean)
adj. - 준엄한, 엄격한, 가혹한

日本語 (Japanese)
adj. - 厳しい, 厳格な, 過酷な, 厳密な, 正確な

العربيه (Arabic)
‏(صفه) صارم, قاس,‏

עברית (Hebrew)
adj. - ‮קשה, מחמיר, קפדני, קודר (מזג-אוויר)‬

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Some good "rigorous" pages on the web: