Definition of underused adjective from the Oxford Advanced American Dictionary

 

underused

 adjective
adjective
NAmE//ˌʌndərˈyuzd//
 
(formal underutilized)
 
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not used as much as it could or should be The airport is currently grossly underused.
NAmE//ˌʌndərˈyus//
 
, NAmE//ˈʌndərˌyus//
 
(formal underutilization) noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: underused