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Noun: underuse
  1. Use of something less than expected or would be optimal
    "The underuse of public transportation led to increased traffic congestion";
    - underutilization, underutilisation [Brit]
Verb: underuse
  1. Use less than would be optimal
    "Half of workers feel their skills are underused";
    - underutilize, underutilise [Brit]

Derived forms: underused, underuses, underusing