underactive
Not working enough
Underactive means functioning below normal or expected levels.
The term appears most often in medical contexts: an underactive thyroid produces insufficient hormones.
More generally, anything operating with less than typical activity can be called underactive: an underactive imagination, underactive markets.
Slow and inactive
- torpidInactive and slow
- languidWeak and without vigor
- listlessLacking energy or enthusiasm
- lethargicLacking energy or alertness
drowsy · enervated · slothful · lackadaisical · leaden · plodding · ponderous · unhurried
Deficient gland function
- thyroidHormone-producing neck gland
- levothyroxineSynthetic hormone medication
- thyroxineThyroid-produced metabolic hormone
- T4Immune cell type
T3 · goiter · endocrine · gland · metabolism · iodine · autoimmune · hypofunction
Without activity or purpose
- quiescentInactive but capable
- staticWithout motion or change
- inertInactive, physically or chemically
- stagnantWithout movement or progress
immobile · motionless · resting · unused · mothballed · fallow · latent · suspended
Lacking incentive or drive
- disengagedNot participating or invested
- passiveNot actively participating
- indifferentLacking interest or concern
- uninterestedLacking curiosity or concern
detached · unenthusiastic · phlegmatic · blasé · nonchalant · uninspired · half-hearted · spiritless
sluggish
Slow and inactive
lethargic · drowsy · enervated · slothful · lackadaisical · leaden · plodding · ponderous · unhurried · slow
hypothyroid
Deficient gland function
- thyroidHormone-producing neck gland
- levothyroxineSynthetic hormone medication
- thyroxineThyroid-produced metabolic hormone
T4 · T3 · goiter · endocrine · gland · metabolism · iodine · autoimmune · hypofunction · subclinical
idle
Without activity or purpose
stagnant · immobile · motionless · resting · unused · mothballed · fallow · latent · suspended · sleeping
unmotivated
Lacking incentive or drive
- disengagedNot participating or invested
- passiveNot actively participating
- indifferentLacking interest or concern
uninterested · detached · unenthusiastic · phlegmatic · blasé · nonchalant · uninspired · half-hearted · spiritless · flat
- intensity levelshigh, low, moderate, medium, intense
- sensitivitysensitivity, sensitive, hypersensitivity, oversensitivity, hypersensitive
- gland descriptorsadrenal, endocrine, exocrine, hormonal, mammary
underactiveoveractive
Excessively active or busy
hyperactive · active · overstimulated · hyperkinetic · energetic
- underactive thyroidInsufficient hormone production condition