noun
a person who does not adhere to a particular belief or practice
adjective
not sticking or adhering to something
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The patient was identified as nonadherent to their medication regimen.
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She's always forgetting to take her pills, such a nonadherent.
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He's a total pill-forgetter, the biggest nonadherent I know.
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The team member was nonadherent to the company's policies, causing tension in the workplace.