rigorous

adjective

rig·​or·​ous ˈri-g(ə-)rəs 

1

: manifesting, exercising, or favoring rigor : very strict

2

a

: marked by extremes of temperature or climate

b

: harsh, severe

3

: scrupulously accurate : precise

rigorously adverb

rigorousness noun

Synonyms

• austere
• authoritarian
• flinty
• hard
• harsh
• heavy-handed
• ramrod
• rigid
• severe
• stern
• strict
• tough

Choose the Right Synonym for rigorous

rigid, rigorous, strict, stringent mean extremely severe or stern.

rigid implies uncompromising inflexibility.

rigid rules of conduct

rigorous implies the imposition of hardship and difficulty.

the rigorous training of recruits

strict emphasizes undeviating conformity to rules, standards, or requirements.

strict enforcement of the law

stringent suggests severe, tight restriction or limitation.

stringent standards of admission

Examples of rigorous in a Sentence

rigorous enforcement of the rules

a rigorous course of study

We subjected the data to a rigorous analysis.

Recent Examples on the Web

That’s the cost of such rigorous theming: Since you’re supposed to be inside a game, anything that gets in the way of that illusion is banned. —Todd Anderson, New York Times, 5 Apr. 2025

To receive autism certification through Autism Double Checked, staff at participating properties go through rigorous training on how to best support their autistic guests, such as how to adapt a menu for a picky eater and how to avoid strongly scented cleaning products. —Jamie Davis Smith, AFAR Media, 4 Apr. 2025

There are a variety of platforms that can support rigorous experimentation and analysis. —Roli Saxena, Forbes.com, 4 Apr. 2025

In 1968, amid urban unrest eerily similar to the tensions today, dedicated scholars built institutes such as the Urban Institute and Johns Hopkins’ Center for Metropolitan Planning and Research to bring rigorous evidence to bear on pressing social problems. —Andrew V. Papachristos, Chicago Tribune, 3 Apr. 2025

Word History

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for rigorous

• vigorous

Kids Definition

rigorous

adjective

rig·​or·​ous ˈrig-(ə-)rəs 

1

: very strict

2

: marked by great differences of temperature or climate

3

: very accurate

rigorously adverb

rigorousness noun