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New American Oxford Dictionary

underactive

un der act ive |ˌəndərˈaktiv ˌəndərˈæktɪv | ▶adjective insufficiently active: a health problem such as an underactive thyroid.

 

Oxford Dictionary

underactive

underactive |ʌndərˈaktɪv | ▶adjective insufficiently active: a health problem such as an underactive thyroid.