undiscovered

a.未被发现的

underweight, underwent, underworld, underwrite, underwriter, undeserved, undeservedly, undeserving, undesignated, undesirable, undesirably, undetectable, undeterred, undeveloped, undid, undies, undignified, undirected, undischarged, undisclosed, undisputed, undistinguished, undisturbed, undivided, undo, undoing, undone, undoubted, undoubtedly, undreamed-of, undress, undressed, undrinkable, undue, undulate, undulation, unduly, undying, unearned, unearth,