| undiagnosable | (adjective) not possible to diagnose | - |
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| undiagnosed | (adjective) eluding diagnosis | - |
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| undifferentiated | (adjective) not differentiated | Synonyms: uniform |
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| undigested | (adjective) not digested | - |
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| (adjective) not thought over and arranged systematically in the mind; not absorbed or assimilated mentally | - |
| undignified | (adjective) lacking dignity | - |
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| undiluted | (adjective) not diluted | - |
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| undiminished | (adjective) not lessened or diminished | Synonyms: unrelieved |
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| undimmed | (adjective) not made dim or less bright | Synonyms: bright |
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| undiplomatic | (adjective) not skilled in dealing with others | - |
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| undirected | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, directionless, planless, rudderless |
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| undiscerning | (adjective) lacking discernment | - |
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| undischarged | (adjective) still capable of exploding or being fired | Synonyms: unexploded |
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| (adjective) owed as a debt | Synonyms: outstanding, owing |
| undisciplined | (adjective) lacking in discipline or control | Synonyms: ungoverned |
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| (adjective) not subjected to correction or discipline | Synonyms: uncorrected |
| (adjective) not subjected to discipline | - |
| undisclosed | (adjective) not made known | Synonyms: unrevealed |
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| undiscouraged | (adjective) not deterred | Synonyms: undeterred |
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| undiscoverable | (adjective) not able to be ascertained; resisting discovery | Synonyms: unascertainable |
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| undiscovered | (adjective) not discovered | - |
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| (adjective) not yet discovered | Synonyms: unexplored |
| undiscriminating | (adjective) not discriminating | Synonyms: indiscriminating |
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| undisguised | (adjective) plain to see | - |
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| undismayed | (adjective) unshaken in purpose | Synonyms: undaunted, unshaken |
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| undisputable | (adjective) not open to question; obviously true | Synonyms: incontestable, indisputable |
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| undisputed | (adjective) generally agreed upon; not subject to dispute | Synonyms: unchallenged, unquestioned |
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| undissolved | (adjective) retaining a solid form | - |
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| undistinguishable | (adjective) not capable of being distinguished or differentiated | Synonyms: indistinguishable |
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| undistinguished | (adjective) not special in any way; lacking distinction | Synonyms: mine run, run-of-the-mill, run-of-the-mine, unexceptional |
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| undistorted | (adjective) without alteration or misrepresentation | - |
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| undistributed | (adjective) (of investments) not distributed among a variety of securities | - |
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| undisturbed | (adjective) untroubled by interference or disturbance | - |
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| undiversified | (adjective) not diversified | - |
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| undividable | (adjective) cannot be divided without leaving a remainder | Synonyms: indivisible by |
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| undivided | (adjective) not divided among or brought to bear on more than one object or objective | Synonyms: exclusive, single |
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| (adjective) not parted by conflict of opinion | - |
| (adjective) not shared by or among others | - |
| (adjective) not separated into parts or shares; constituting an undivided unit | - |