| unfilled | (adjective) of purchase orders that have not been filled | - |
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| unfilmed | (adjective) not recorded on film or tape | Synonyms: untaped |
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| unfinished | (adjective) not brought to an end or conclusion | - |
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| (adjective) not brought to the desired final state | - |
| (adjective) lacking a surface finish such as paint | Synonyms: bare |
| unfirm | (adjective) (of soil) unstable | Synonyms: shifting |
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| (adjective) not firmly or solidly positioned | Synonyms: unsteady |
| unfit | (adjective) not in good physical or mental condition; out of condition | - |
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| (adjective) below the required standards for a purpose | - |
| (adjective) physically unsound or diseased | Synonyms: bad, unsound |
| unfitting | (adjective) not in keeping with what is correct or proper | Synonyms: inappropriate, incompatible, out of keeping |
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| unfixed | (adjective) not firmly placed or set or fastened | - |
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| (adjective) lacking definition or definite content | Synonyms: nebulous |