Definition

1. Adjective:
   • Demanding strict attention to rules and procedures: Characterized by or showing strictness, severity, or precision in adherence to standards, rules, or methods.
   • Rigidly accurate; allowing no deviation from a standard: Extremely thorough, exhaustive, and precise, leaving no room for error or leniency.
   • (Of conditions) harsh, severe, or demanding: Extremely challenging, difficult, or unforgiving, often describing climates, training, or tests.

Examples of Usage

• Describing strict procedures or standards:
  • The academy has a rigorous admissions process.
  • She follows a rigorous daily routine to maintain her fitness.
• Describing precision and accuracy:
  • The experiment was designed with rigorous scientific methodology.
  • A rigorous analysis of the data revealed new patterns.
• Describing harsh conditions:
  • The expedition faced rigorous winter conditions in the mountains.
  • The training program is physically and mentally rigorous.

Advanced Usage

• "Rigorous testing": A process of thorough and demanding examination or evaluation.
  • The new drug underwent rigorous testing before approval.
• "Rigorous standards": Extremely strict and precise criteria that must be met.
  • The factory operates under rigorous standards of quality control.
• "Intellectually rigorous": Demanding careful, logical, and precise thought.
  • The book provides an intellectually rigorous critique of the theory.

Variants and Related Words

• Rigor (noun): The quality of being extremely thorough, exhaustive, or accurate; also, a harsh or severe condition.
  • The rigor of the academic program is well-known.
  • The soldiers were hardened by the rigor of their training.
• Rigorously (adverb): In an extremely thorough, accurate, or demanding way.
  • The procedures must be followed rigorously.

Synonyms

• Stringent: (Of regulations or requirements) strict, precise, and exacting.
• Strict: Demanding that rules concerning behavior are obeyed and observed.
• Exacting: Making great demands on one's skill, attention, or other resources.
• Meticulous: Showing great attention to detail; very careful and precise.

Antonyms

• Lax: Not sufficiently strict, severe, or careful.
• Lenient: More merciful or tolerant than expected.
• Careless: Not giving sufficient attention or thought to avoiding harm or errors.
• Loose: Not strict or exact; relaxed.

Related Phrases and Collocations

• Rigorous application: The strict and thorough putting into practice of a rule or principle.
  • The rigorous application of the law ensured fairness.
• Rigorous discipline: A state of order and control maintained by strict rules and punishment.
  • The school was known for its rigorous discipline.
• Rigorous proof: A proof in mathematics or logic that is complete and leaves no gaps or doubts.
  • The theorem was finally established with a rigorous proof.

Adjective

1. demanding strict attention to rules and procedures
   • rigorous discipline
   • tight security
   • stringent safety measures
2. rigidly accurate; allowing no deviation from a standard
   • rigorous application of the law
   • a strict vegetarian