| uncivilized | (adjective) without civilizing influences | Synonyms: barbarian, barbaric, savage, uncivilised, wild |
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| uncommercialized | (adjective) not having been commercialized | Synonyms: uncommercialised |
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| uncrystallized | (adjective) not finally or definitely formed | Synonyms: uncrystallised |
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| (adjective) without real or apparent crystalline form | Synonyms: amorphous, uncrystallised |
| undersized | (adjective) smaller than normal for its kind | Synonyms: undersize |
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| unequalized | (adjective) not caused to be equal | Synonyms: unequalised |
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| unfertilized | (adjective) not having been fertilized | Synonyms: unfertilised, unimpregnated |
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| unhomogenized | (adjective) not having undergone homogenization | Synonyms: unhomogenised |
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| unindustrialized | (adjective) not converted to industrialism | Synonyms: unindustrialised |
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| unionized | (adjective) not converted into ions | Synonyms: nonionic, nonionised, nonionized, unionised |
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| (adjective) being a member of or formed into a labor union | Synonyms: organised, organized, unionised |
| unmechanized | (adjective) not mechanized | Synonyms: unmechanised |
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| unmodernized | (adjective) not brought up to date | Synonyms: unmodernised |
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| unmotorized | (adjective) having no motor | Synonyms: motorless, unmotorised |
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| unnaturalized | (adjective) not having acquired citizenship | Synonyms: unnaturalised |
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| unorganized | (adjective) not having or belonging to a structured whole | Synonyms: unorganised |
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| (adjective) not affiliated in a trade union | Synonyms: nonunionised, nonunionized, unorganised |
| unpasteurized | (adjective) not having undergone pasteurization | Synonyms: unpasteurised |
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| unpatronized | (adjective) having little patronage or few clients | Synonyms: patronless, unpatronised |
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| unrealized | (adjective) of persons; marked by failure to realize full potentialities | Synonyms: unfulfilled, unrealised |
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| unrecognized | (adjective) not recognized | Synonyms: unrecognised |
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| (adjective) not having a secure reputation | Synonyms: unrecognised |
| unsized | (adjective) not fashioned to sizes | - |
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| (adjective) not having the surface treated or coated with sizing | - |
| unspecialized | (adjective) not specialized or modified for a particular purpose or function | Synonyms: unspecialised |
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| unsterilized | (adjective) not sterilized | Synonyms: unsterilised |
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| unsynchronized | (adjective) not occurring together | Synonyms: nonsynchronous, unsynchronised, unsynchronous |
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| unverbalized | (adjective) not made explicit | Synonyms: unexpressed, unsaid, unspoken, unstated, unuttered, unverbalised, unvoiced |
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| unvulcanized | (adjective) (used of rubber) not subjected to the process of vulcanization | Synonyms: unvulcanised |
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| urbanized | (adjective) made urban in nature; taking on urban characteristics | Synonyms: urbanised |
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| utilized | (adjective) made useful | Synonyms: employed, utilised |
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| vaporized | (adjective) converted into a gas or vapor | Synonyms: gasified, vapourised, volatilised, volatilized |
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| verbalized | (adjective) communicated in words | Synonyms: expressed, uttered, verbalised, voiced |
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| victimized | (adjective) (of persons) taken advantage of | Synonyms: exploited, ill-used, put-upon, used, victimised |
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| visualized | (adjective) seen in the mind as a mental image | Synonyms: envisioned, pictured, visualised |
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| volatilized | (adjective) converted into a gas or vapor | Synonyms: gasified, vaporized, vapourised, volatilised |
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| vulcanized | (adjective) (used of rubber) treated by a chemical or physical process to improve its properties (hardness and strength and odor and elasticity) | Synonyms: cured, vulcanised |
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