| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| antediluvian | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvial |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antiquated, archaic |
| dilute | (adjective) reduced in strength or concentration or quality or purity | Synonyms: diluted |
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| diluted | (adjective) reduced in strength or concentration or quality or purity | Synonyms: dilute |
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| diluvial | (adjective) of or connected with a deluge | Synonyms: diluvian |
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| diluvian | (adjective) of or connected with a deluge | Synonyms: diluvial |
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| postdiluvian | (adjective) existing or occurring after Noah's flood | - |
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| undiluted | (adjective) not diluted | - |
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