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 of rigorous

• strict
• tough
• harsh
• authoritarian
• rigid
• stern

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

These platforms must forge collaborative networks that mutually reinforce one another and establish a rigorous framework that makes the cultural values of the biennial format legible, tangible, and palpable to various segments of society in the immediate locale and across the continent. —Smooth Nzewi, Artforum, 2 Apr. 2026

The school integrates four years of rigorous academics with four years of professional work experience through its corporate work study program. —Christina Mayo, Miami Herald, 2 Apr. 2026

There’s little rigorous research nationwide proving that weapon detectors prevent school shootings. —Jeff Amy, Los Angeles Times, 31 Mar. 2026

For years, women in Israel committed themselves to rigorous Torah scholarship, mastering complex halachic material and serving their communities as teachers and spiritual leaders, yet were barred from even attempting the state rabbinate exams. —Rabba Sara Hurwitz, Sun Sentinel, 31 Mar. 2026

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