underdeal

verb

1. (ambitransitive)To deal insufficiently or inadequately; have dealings which are below requirement or expectation

   “Another cause for sending bills late is that the Assessor could underdeal with property-owner by delaying assessment.”

   “Extended family issues (Mom overdeals with his family and Dad underdeals with his family.)”

   “When one partner (usually the man) underdeals with a parent or family member, the other partner (usually the woman) is likely to overdeal with that same person.”