un·der·ac·tive 
(ŭn′dər-ăktĭv)
(ŭn′dər-ăktĭv)adj.
Characterized by insufficient or abnormally low activity: an underactive area of the brain.
un′der·ac·tivi·ty (-ĭ-tē) n.
- hypophysial
- hypophysis
- hypopigmentation
- hypopituitarism
- hypopituitary
- hypoplasia
- hypoplastic
- hypoploid
- hypoploidy
- hypopnea
- hypopneic
- hyposensitive
- hyposensitivity
- hyposensitization
- hyposensitize
- hypostasis
- hypostatic
- hypostatical
- hypostatically
- hypostatization
- hypostatize
- hyposthenia
- hyposthenic
- hypostyle
- hyposulfite