| undeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: indeterminable |
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| undetermined | (adjective) not yet having been ascertained or determined | - |
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| (adjective) not precisely determined or established; not fixed or known in advance | Synonyms: indeterminate |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: open, undecided, unresolved |
| undeterred | (adjective) not deterred | Synonyms: undiscouraged |
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| undeveloped | (adjective) not developed, mature, or fully formulated | - |
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| (adjective) not developed, improved, exploited or used | Synonyms: unexploited |
| undeviating | (adjective) going directly ahead from one point to another without veering or turning aside | Synonyms: unswerving |
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| (adjective) used of values and principles; not subject to change; steady | - |
| unfounded | (adjective) without a basis in reason or fact | Synonyms: baseless, groundless, idle, unwarranted, wild |
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| unfunded | (adjective) not furnished with funds | - |
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| unsounded | (adjective) situated at or extending to great depth; too deep to have been sounded or plumbed | Synonyms: profound, unfathomed, unplumbed |
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| (adjective) not made to sound | Synonyms: silent |
| ununderstood | (adjective) not understood | - |
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| unwounded | (adjective) not wounded | - |
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| wounded | (adjective) suffering from physical injury especially that suffered in battle | Synonyms: hurt |
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