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Undubitable
- Indubitable; as, an undubitable principle.
Undueness
- The quality of being undue.
Undulary
- Moving like waves; undulatory.
Undulationist
- One who advocates the undulatory theory of light.
Undulative
- Consisting in, or accompanied by, undulations; undulatory.
Undull
- To remove the dullness of; to clear.
Undumpish
- To relieve from the dumps.