| boracic | (adjective) of or relating to or derived from or containing boron | Synonyms: boric |
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| borated | (adjective) mixed or impregnated with borax | - |
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| bordered | (adjective) having a border especially of a specified kind; sometimes used as a combining term | - |
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| borderline | (adjective) of questionable or minimal quality | Synonyms: marginal |
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| boreal | (adjective) toward or located in the north | - |
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| (adjective) relating to or marked by qualities associated with the north wind | - |
| (adjective) comprising or throughout far northern regions | Synonyms: circumboreal |
| bored | (adjective) tired of the world | Synonyms: world-weary |
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| (adjective) uninterested because of frequent exposure or indulgence | Synonyms: blase |
| boric | (adjective) of or relating to or derived from or containing boron | Synonyms: boracic |
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| boring | (adjective) so lacking in interest as to cause mental weariness | Synonyms: deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome |
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| born | (adjective) brought into existence | - |
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| (adjective) being talented through inherited qualities | Synonyms: innate, natural |
| boronic | (adjective) of or relating to boron | - |
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