From un- + tupped. <span class="searchmatch">untupped</span> (not comparable) That has not been tupped or mated with. 1985, The Parliamentary Debates (Hansard), Official Report, 5th Series...
Official Report, 5th Series, page 227: With regard to the yeld ewes, <span class="searchmatch">untupped</span>, may I ask the Minister what this means? yelde, yeild, geld, ȝelde, ȝeld...