Both words are adjectives (words that describe a noun).
- Strangely, the children were totally uninterested in video games.
- The game barker spoke in an uninterested voice.
- Not influenced by considerations of personal advantage. Example: A judge is under an obligation to be disinterested in court proceedings.
- Having or feeling no interest in something. Example: The manager was so disinterested in his department’s progress that he visited the office only once.
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