dis·in·ter·est·ed / disˈintəˌrestid; -tristid/ • adj. 1. not influenced by considerations of personal advantage: a banker is under an obligation to give disinterested advice. 2. having or feeling no interest in something: her father was so disinterested in her progress that he only visited the school once. DERIVATIVES: dis·in·ter·est·ed·ly adv. dis·in·ter·est·ed·ness n.
Free from bias, prejudice, or partiality.
A disinterested witness is one who has no interest in the case at bar, or matter in issue, and is legally competent to give testimony.