Not seconded; not supported, aided, or assisted.(adjective)
Not exemplified a second time.(adjective)
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Use "unseconded" in a sentence
"/ O miracle of men! him did you leave,— / Second to none, unseconded by you...."
"Timely services, therefore, and proper restraints are the only methods with which such persons are to be treated, for minds disposed to such gross impurities as those which lead to such wickednesses or are rendered capital by Law, are seldom to be prevailed on by gentleness, or admonitions unseconded by harsher means."
"She needed no explanation of why Marian had refused an offer from the lips and unseconded by the heart."