underactivity

Below normal output

Underactivity is insufficient or below-normal activity.

The term appears most often in medical contexts describing glands or organs that aren't producing enough: thyroid underactivity, underactivity of the immune system.

It can also describe inadequate physical movement or engagement: The study linked underactivity in children to later health problems.

hypokinetic

bradykinesia

Pathological movement slowness

parkinsonism · muscle weakness · rigidity · slowness · catatonia · paralysis · motionless · understimulation · debility · neurodegenerative

lethargic

fatigue

Weariness from prolonged exertion

malaise · weariness · drowsiness · somnolence · lassitude · sluggishness · enervation · tiredness · exhaustion · stupor

dormant

hibernation

Prolonged winter dormancy

latency · estivation · diapause · suspended · fallow · resting · latent · overwintering · vegetative · inert

deficient

insufficient

Below required quantity

underperforming · underachieving · below capacity · subnormal · underutilized · underwhelming · underworking · low output

idle

lounging

Reclining in idleness

vegging · lolling · pottering · dawdling · bumming · mooching · loitering · couch potato · slacking · killing time

Opposites
level of activity or function

underactivityoveractivity

Excessive or heightened action

hyperactivity · activity · overstimulation · hyperkinesis · hyperstimulation

Family

active, activity, inactive, activate, inactivity, proactive, reactivity, interactivity, hyperactivity

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