con·trolled [k?n tr?ld] adjective 1. kept under control: kept in check and not expressed fully or at all She spoke with scarcely controlled fury. 2. carefully regulated: carefully measured and regulated, especially in relation to medical treatments or scientific experiments They tested the effectiveness of controlled doses of the drug. 3. done with skill and discipline: showing the skill, judgment, and discipline needed in order to achieve a desired result, without doing too little or too much His controlled performance as Lear was masterful.