| bignoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Bignoniaceae | - |
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| ignoble | (adjective) completely lacking nobility in character or quality or purpose | - |
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| (adjective) not of the nobility | Synonyms: ungentle, untitled |
| ignominious | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, inglorious, opprobrious, shameful |
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| ignorant | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: unknowing, unknowledgeable, unwitting |
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| (adjective) uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field | Synonyms: illiterate |
| (adjective) uneducated in general; lacking knowledge or sophistication | Synonyms: nescient, unlearned, unlettered |
| ignored | (adjective) disregarded | Synonyms: neglected, unheeded |
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