| unleaded | (adjective) not treated with lead | Synonyms: leadless |
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| (adjective) not having leads between the lines | - |
| unlearn | (verb) discard something previously learnt, like an old habit | - |
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| (verb) try to forget; put out of one's memory or knowledge | - |
| 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 | - |
| unleash | (verb) release or vent | - |
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| (verb) release from a leash | - |
| (verb) turn loose or free from restraint | Synonyms: let loose, loose |
| 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 |