1. not influenced by personal interest or advantage; impartial
Usage: formal
2. having no interest in something; uninterested
Usage: informal; sometimes considered incorrect usage

Examples

• The judge remained disinterested throughout the trial.
• We need a disinterested party to mediate the dispute.
• The committee sought disinterested advice from experts.
• She seemed disinterested in the conversation.
• His disinterested attitude toward sports surprised his friends.
• The referee must be completely disinterested in the outcome.
• Many students appeared disinterested during the lecture.