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Undauntable
- Incapable of being daunted; intrepid; fearless; indomitable.
Unde
- Waving or wavy; -- applied to ordinaries, or division lines.
Undeadly
- Not subject to death; immortal.
Undeaf
- To free from deafness; to cause to hear.
Undecane
- A liquid hydrocarbon, C11H24, of the methane series, found in petroleum; -- so called from its containing eleven carbon atoms in the molecule.
Undecennary
- Occurring once in every period of eleven years; undecennial.
Undecennial
- Occurring or observed every eleventh year; belonging to, or continuing, a period of eleven years; undecennary; as, an undecennial festival.