Objective: to translate, culturally adapt and validate the Full Outline of UnResponsiveness scale into Brazilian Portuguese. Method: a methodological study carried out at the Clinical Hospital of Universidade Federal do Triângulo Mineiro, Uberaba, Brazil, through the following stages: translation, synthesis, evaluation by the experts' committee, back-translation, consensus, semantic evaluation and pre-test. A sample of 188 adult patients was reached. Data collection took place between August

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... December 2020. Concurrent criterion validity was analyzed by comparing the Full Outline of UnResponsiveness scale with the Glasgow Coma Scale by means of Spearman's and Pearson's correlation coefficients; and predictive validity analysis was performed with Cox Regression, Sensitivity and Specificity and Area Under the Receiver Operating Characteristic Curve. The Cronbach's alpha, weighted Kappa and Intraclass Correlation coefficients were also adopted for interobserver reliability. Results: Spearman's test for the motor and eye response items, respectively, resulted in 0.81 and 0.96, and Pearson's test for the total score was 0.97. A relative risk of 0.80, 95.5% specificity, 51.6% sensitivity and accuracy of 0.80 (95% CI: 0.688-0,905, p<0.001) were obtained. Cronbach's alpha was 0.94, weighted Kappa varied from 0.89 to 1.0, and ICC resulted in 0.99. Conclusion: the Full Outline of UnResponsiveness scale (Brazilian version), maintained four domains and the 20 items from the original scale, making it appropriate for use in Brazil and contributing to the assessment of the level of consciousness and prognosis of adult patients in severe conditions.