noun
a person or thing that is not able to exist or work together in a harmonious way
adjective
not able to exist or work together in a harmonious way
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The new software update is incompatible with the old operating system.
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My phone and my laptop are incompatible when it comes to sharing files.
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Their personalities are just so incompatible, they can't get along.
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Her strict work schedule is incompatible with his laid-back lifestyle.