rigorous

IPA/ˈrɪɡərəs/
KK[rˈɪɡɚəs]IPA/ˈrɪɡərəs/

rigorous — adjective

  • rigorouspositive
  • more rigorouscomparative
  • most rigoroussuperlative

1. performed or carried out with great thoroughness, including a careful check of e

1.adjectiveB2
Definition

performed or carried out with great thoroughness, including a careful check of every detail to make sure nothing is wrong or incomplete.

Example

The laboratory follows a rigorous testing protocol for all new drugs.

collocation: rigorous testing / rigorous analysis / rigorous review

Before publishing, every article goes through a rigorous review process.

Common collocations
  • rigorous testing
  • rigorous analysis
  • rigorous standards
  • rigorous examination
  • rigorous review
  • rigorous in
Synonyms
  • thorough

    similar in meaning but less formal and does not always carry the idea of strict precision

  • meticulous

    emphasises extreme care for small details, often used for people rather than processes

  • precise

    focuses on accuracy of measurement or description rather than the breadth of checking

  • scrupulous

    suggests moral carefulness and ethical attention, not just procedural thoroughness

Antonyms
  • careless

    opposite in that no attention is paid to details

  • sloppy

    informal; describes work done without care or thoroughness

Grammar Patterns

rigorous + noun

be rigorous in + noun/gerund

Usage Note

Frequently used in academic or professional contexts to describe methods, standards, tests, or examinations. The adverb form 'rigorously' is common with verbs like 'test', 'examine', or 'check'.

Common Mistakes

The scientist made a rigorous research.
The scientist conducted rigorous research.
'research' is an uncountable noun; use 'rigorous' directly before it without an article.

2. applying or demanding strict adherence to rules, standards, or discipline, with

2.adjectiveB2
Definition

applying or demanding strict adherence to rules, standards, or discipline, with very little or no flexibility allowed.

Example

The military academy enforces rigorous discipline among its cadets.

collocation: rigorous discipline / rigorous rules / rigorous training

New employees must pass a rigorous training programme before they start working.

Common collocations
  • rigorous discipline
  • rigorous training
  • rigorous rules
  • rigorous regime
  • rigorous about
  • rigorous with
Synonyms
  • strict

    more common and slightly less formal; focuses on rule enforcement

  • stringent

    formal; often describes official rules, laws, or conditions

  • severe

    stronger and more negative; suggests harshness or punishment

  • harsh

    carries a stronger negative feeling and suggests unfairness or cruelty

Antonyms
  • lenient

    describes a relaxed approach to rules or discipline

  • lax

    suggests a lack of proper control, often with a critical tone

Grammar Patterns

rigorous + noun

be rigorous about + noun/gerund

Usage Note

Often describes systems, institutions, or people that demand strict rule-following. Distinguish from sense 1 (THOROUGH): this sense applies to rules and control of behaviour, not to careful checking of facts or methods.

Common Mistakes

The teacher was rigorous to the students.
The teacher was rigorous with the students.
use 'rigorous with someone' when referring to a person being strict.

Word family

  • rigorously
    adverbB2
  • rigor
    nounB2
  • rigorousness
    nounC1

Synonym discussion

Sense: adjective/1

All four words describe careful, detailed work, but they differ in emphasis. 'Thorough' is the broadest and most neutral term — a thorough check covers everything without missing parts. 'Meticulous' adds a personal quality: a meticulous person takes extreme care over tiny details, sometimes to the point of slowness. 'Precise' focuses on exactness of measurement, description, or execution rather than breadth of coverage. 'Scrupulous' carries an ethical nuance — a scrupulous researcher follows not just procedural rules but moral ones. For example, you would call a medical trial 'rigorous' or 'thorough' because it checks every variable; you would call a watchmaker 'meticulous' and a mathematician 'precise'; and you would call an honest judge 'scrupulous'.

thorough ↗meticulous ↗precise ↗scrupulous

Common collocations

Nouns

Adverbs

  • rigorously
  • less rigorously
  • most rigorously

Phrases

  • rigorous attention to detail
  • rigorous enforcement of rules

Prepositions

  • rigorous in
  • rigorous about
  • rigorous with

Etymology

LatinOld FrenchEnglish

Comes from Latin 'rigor' meaning stiffness or hardness, which in turn comes from 'rigēre' (to be stiff). The sense of physical stiffness shifted over time into figurative meanings of strictness and precision. The word entered English through Old French 'rigoreus' in the 14th century, initially carrying the meaning of harshness or severity, before developing its modern sense of thorough precision.