untapped

• untapt (obsolete, rare)

un- +‎ tapped

untapped (comparative more untapped, superlative most untapped)

1. Not tapped; not drawn on in terms of resources.
   • 2018, James Lambert, “A multitude of ‘lishes’: The nomenclature of hybridity”, in English World-Wide‎, page 18:

     The author kindly welcomes notification of any terms overlooked, any antedatings of earliest attestations, and any untapped sources that may prove to be productive.

   • 2022 April 6, “Open Access: Fewer, longer trains”, in RAIL, number 954, page 64:

     If 90% (often quoted) of the UK public don't use trains regularly, there is a huge untapped potential market for securing extra passengers.

• “untapped”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.