1. process (a film or photographic plate) less than the required time or in an ineffective solution or at an insufficiently high temperature; - Example: "These photos are underdeveloped"
WordNet (r) 3.0 (2006):
underdevelop
v 1: process (a film or photographic plate) less than the
required time or in an ineffective solution or at an
insufficiently high temperature; "These photos are
underdeveloped"