UNDERUSED
Meaning of UNDERUSED in English
un ‧ der ‧ used /ˌʌndəˈjuːzd◂ $ -ər-/ BrE AmE adjective
something that is underused is not used as much as it could be OPP overused
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012