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Adjective: underactive
  1. Abnormally inactive
    - hypoactive

See also: inactive

Nearest

under it
under that
under the circumstances
under the weather
under way
under wraps
underachieve
underachievement
underachiever
underact
underactive
underage
underarm
underbelly
underbid
underbodice
underbody
underboss
underbred
underbrush
undercarriage