Usually means: Lower than normal activity level.
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We found 5 dictionaries that define the word underactivity:

General (4 matching dictionaries)
  1. underactivity: Merriam-Webster
  2. underactivity: Collins English Dictionary
  3. underactivity: Wiktionary
  4. underactivity: Dictionary.com

Medicine (1 matching dictionary)
  1. underactivity: Merriam-Webster Medical Dictionary

(Note: See underactive as well.)

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Definitions from Wiktionary (underactivity)

▸ noun:  insufficient activity

Similar:
underexercise, hypofunctionality, hypometabolism, hypoactivation, hypocholinergia, hypolocomotion, hypoexcitation, underexcretion, hypodynamia, hypotonus, more...

Opposite:
overactivity, hyperactivity, stimulation

Types:
lethargy, fatigue, apathy, depression, hypothyroidism, anemia, insomnia, more...

▸ Words similar to underactivity

▸ Usage examples for underactivity

▸ Idioms related to underactivity

▸ Wikipedia articles (New!)

▸ Popular adjectives describing underactivity

▸ Words that often appear near underactivity

▸ Rhymes of underactivity

▸ Invented words related to underactivity

Similar:
underexercise, hypofunctionality, hypometabolism, hypoactivation, hypocholinergia, hypolocomotion, hypoexcitation, underexcretion, hypodynamia, hypotonus, more...

Opposite:
overactivity, hyperactivity, stimulation

Types:
lethargy, fatigue, apathy, depression, hypothyroidism, anemia, insomnia, more...



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