| apodous | (adjective) (of snakes and eels) naturally footless | Synonyms: apodal |
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| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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| brachiopodous | (adjective) of or belonging to the phylum Brachiopoda | Synonyms: brachiopod |
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| branchiopodous | (adjective) of or relating to or characteristic of the subclass Branchiopoda | Synonyms: branchiopod, branchiopodan |
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| hazardous | (adjective) involving risk or danger | Synonyms: risky, wild |
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| horrendous | (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrific, terrible |
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| pelecypodous | (adjective) bivalve | Synonyms: lamellibranch, pelecypod |
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| stupendous | (adjective) so great in size or force or extent as to elicit awe | Synonyms: colossal, prodigious |
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| tremendous | (adjective) extraordinarily good or great; used especially as intensifiers | Synonyms: fantastic, grand, howling, marvellous, marvelous, phenomenal, rattling, terrific, wonderful, wondrous |
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| (adjective) extraordinarily large in size or extent or amount or power or degree | Synonyms: enormous |
| (adjective) extreme in degree or extent or amount or impact | Synonyms: awful, frightful, terrible |
| unhazardous | (adjective) thought to be devoid of risk | Synonyms: risk-free, riskless |
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