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What is the adjective for underactivity?

What's the adjective for underactivity? Here's the word you're looking for.

underactive
  1. Less than normally active.
  2. Synonyms:
  3. Examples:
    1. “Thus a person with an underactive thyroid can gain weight even on a low-calorie diet.”
      “You are right that many of your symptoms are consistent with an underactive thyroid.”
      “An underactive thyroid can be the result of an auto-immune problem, whereby the body's own antibodies attack the thyroid gland.”
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