Thesaurus.com
Dictionary.com
Showing results for rigorous. Search instead for rigorou.
Definitions

rigorous

[rig-er-uhs] / ˈrɪg ər əs /
ADJECTIVE
severe; exact
Synonyms
STRONGEST
accurate brutal burdensome correct exacting harsh meticulous onerous precise proper rigid scrupulous strict stringent uncompromising
WEAK
ascetic austere bitter definite dogmatic hard inclement inflexible intemperate ironhanded nice oppressive punctilious right rugged stern stiff unpermissive
Antonyms
STRONGEST
careless false flexible gentle imprecise improper inaccurate incorrect inexact lenient negligent questionable soft tolerant unsuitable wrong yielding
WEAK
easygoing lax loose mild

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

By identifying which universals truly stand up to rigorous testing, the study helps narrow the focus for future research.

From Science Daily • Apr. 5, 2026

In Canada gun ownership is regulated by laws that require would-be gun owners to obtain a licence by passing a safety course and rigorous background checks before they can purchase a firearm.

From BBC • Apr. 3, 2026

There is less incentive to fight for an A in a notoriously rigorous course, says freshman Kay Hwang, when students can just take an easier alternative.

From The Wall Street Journal • Apr. 3, 2026

Managers with experienced investment teams, rigorous underwriting standards and strong risk controls are structurally better positioned to navigate periods of stress.

From MarketWatch • Mar. 30, 2026

Valentin Markov came up with a rigorous training program for his pilots.

From "A Thousand Sisters" by Elizabeth Wein

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.