| 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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| undulatory | (adjective) resembling waves in form or outline or motion | Synonyms: undulant |
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| undutiful | (adjective) lacking due respect or dutifulness | Synonyms: impious |
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