undersubscribed

/AH0 N D ER0 S AH0 B S K R AY1 B D/
verb
  1. 1

    To subscribe to an extent that is far less than is available or desirable.

  2. 2

    To have insufficient threads available in a multithreaded application so that all threads become blocked and performance suffers.

  3. 3

    To employ more switch ports than necessary so that high-priority traffic is sure to be handled right away.

adjective
  1. 1

    Having too few subscribers or subscriptions

Source: https://en.wiktionary.org/wiki/undersubscribe, https://en.wiktionary.org/wiki/undersubscribed