| unleaded | (adjective) not treated with lead | Synonyms: leadless |
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| (adjective) not having leads between the lines | - |
| unlearned | (adjective) not established by conditioning or learning | Synonyms: innate, unconditioned |
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| (adjective) uneducated in general; lacking knowledge or sophistication | Synonyms: ignorant, nescient, unlettered |
| (adjective) not well learned | - |
| unleavened | (adjective) made without leavening | Synonyms: unraised |
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| unlettered | (adjective) having little acquaintance with writing | Synonyms: analphabetic |
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| (adjective) uneducated in general; lacking knowledge or sophistication | Synonyms: ignorant, nescient, unlearned |