1. not interesting; dull or boring
Usage: common modern usage; often considered nonstandard by prescriptivists who prefer 'uninteresting'
2. impartial; not influenced by personal interest or bias
Usage: formal or legal contexts; archaic or rare in modern usage

Examples

• The lecture was so disinteresting that half the class fell asleep.
• I found the movie disinteresting and left early.
• A disinteresting presentation of facts without any engaging narrative.
• The judge must remain disinteresting in order to deliver a fair verdict.
• His disinteresting tone made it hard to tell if he actually cared about the outcome.
• The documentary was disinteresting despite its important subject matter.