| undue | (adjective) not yet payable | - |
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| (adjective) not appropriate or proper (or even legal) in the circumstances | - |
| (adjective) beyond normal limits | Synonyms: excessive, inordinate, unreasonable |
| (adjective) lacking justification or authorization | Synonyms: unjustified, unwarranted |
| undulant | (adjective) resembling waves in form or outline or motion | Synonyms: undulatory |
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| undulate | (adjective) having a wavy margin and rippled surface | - |
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| (verb) increase and decrease in volume or pitch, as if in waves | - |
| (verb) move in a wavy pattern or with a rising and falling motion | Synonyms: flap, roll, wave |
| (verb) stir up (water) so as to form ripples | Synonyms: cockle, riffle, ripple, ruffle |
| (verb) occur in soft rounded shapes | Synonyms: roll |
| undulation | (noun) (physics) a movement up and down or back and forth | Synonyms: wave |
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| (noun) wavelike motion; a gentle rising and falling in the manner of waves | - |
| (noun) an undulating curve | Synonyms: wave |
| undulatory | (adjective) resembling waves in form or outline or motion | Synonyms: undulant |
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| unduly | (adverb) to an undue degree | - |
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| undutiful | (adjective) lacking due respect or dutifulness | Synonyms: impious |
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| undutifulness | (noun) impiety characterized by lack of devotion to duty | - |
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