Not having been tapped: an untapped cask of wine. (adjective)
Not utilized: untapped resources. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "untapped" in a sentence
"The United States has discovered nearly $1 trillion in untapped mineral deposits in Afghanistan, far beyond any previously known reserves and enough to fundamentally alter the Afghan economy and perhaps the Afghan war itself, according to senior American government officials."
"Although Chinese companies have expanded aggressively in untapped markets such as Africa, Mr. Alierta's growth ambitions are confined to the markets in which Telef ó nica already operates."
"Someone raised the issue of the vast sources of collective intelligence that remain untapped in terms of the education system, and Surowiecki concurred that bureaucracies in general do a very poor job of tapping into their members 'intelligence."