underactive

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Related to underactively: hypothyroidism, Underactive thyroid

underactive

(ŭn′dər-ăk′tĭv)
adj.
Characterized by insufficient or abnormally low activity: an underactive area of the brain.

un′der·ac·tiv′i·ty (-ĭ-tē) n.

underactive

Functioning at less than full efficiency or productivity; said, for example, of glands such as the thyroid or the adrenals.