# rigorous

/ˈɹɪɡɝəs/ (US) · /ɹˈɪɡəɹəs/ (UK)

Source: https://englishreference.com/word/rigorous
Updated: 2026-06-20

## Senses

### 1. thorough and careful

adjective · CEFR B2 · Academic

very careful and detailed to make sure everything is correct.

For teachers: characterised by scrupulous accuracy and attention to detail; adhering strictly to a set of standards or methods.

- The scientists conducted a rigorous test to make sure the new medicine was safe.
- The peer-review process for the journal is exceptionally rigorous, ensuring that only the most methodologically sound research reaches publication.

Usage: Often used to describe research, testing, analysis, or training.

### 2. strict and demanding

adjective · CEFR B2

strict and following the rules exactly, often in a way that is difficult.

For teachers: strictly applied or enforced; demanding high levels of discipline or effort.

- The army has a rigorous training program for new soldiers.
- The academy maintains rigorous standards of conduct, and students who fail to comply are often asked to leave.

### 3. harsh or severe

adjective · CEFR C1 · Literary

very difficult or unpleasant to live through, like a cold winter.

For teachers: harsh, severe, or extremely inclement, particularly in reference to weather or living conditions.

- The explorers had to survive a rigorous winter in the mountains.
- The expedition was ill-prepared for such a rigorous climate, lacking the specialised equipment necessary to endure sub-zero temperatures for months.

## Examples

- The students underwent rigorous training before the final exam.
- The new medication passed a rigorous testing process to ensure it was safe for public use.
- Academic journals require a rigorous peer-review process to maintain the integrity of the research they publish, ensuring that only the most robust findings reach the scientific community.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.