[ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]未得到充分利用的 Something useful that is underused is not used as much for people's benefit as it could be.
At present many schools' sports grounds are grossly underused.
目前许多学校的体育场都根本没有得到充分的利用。
...areas where muscles are underused and underdeveloped.
肌肉未得到充分利用而发育不良的地方
...underused land.
未得到充分利用的土地
Oxford
under·used/ˌʌndəˈjuːzd; NAmEˌʌndərˈjuːzd/(alsoformalunder·util·ized)adjectivenot used as much as it could or should be 未充分利用的;浪费的▶under·use/ˌʌndəˈjuːs; NAmEˌʌndərˈjuːs/(alsoformalunder·util·iza·tion)noun[uncountable ]underuseunderusesunderusedunderusingunder·used/ˌʌndəˈjuːzd; NAmEˌʌndərˈjuːzd/under·use/ˌʌndəˈjuːs; NAmEˌʌndərˈjuːs/