subthreshold

/sʌbˈθrɛʃhoʊld/
adjective
  1. Below the level at which something becomes noticeable, effective, or active.
    • Subthreshold electrical signals can still influence a nerve cell even if they don't trigger a response.
    • The patient's symptoms were subthreshold, so the doctor did not diagnose a full disorder.
    • Many people experience subthreshold anxiety that doesn't meet the criteria for a clinical diagnosis.
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