| 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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| double | (adjective) used of homologous chromosomes associated in pairs in synapsis | Synonyms: bivalent |
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| (adjective) used of flowers having more than the usual number of petals in crowded or overlapping arrangements | - |
| (adjective) having two meanings with intent to deceive | Synonyms: forked |
| (adjective) large enough for two | - |
| (adjective) twice as great or many | Synonyms: doubled, two-fold, twofold |
| (adjective) consisting of or involving two parts or components usually in pairs | Synonyms: dual, duple |
| (adjective) having more than one decidedly dissimilar aspects or qualities | Synonyms: dual, three-fold, threefold, treble, two-fold, twofold |
| doubled | (adjective) twice as great or many | Synonyms: double, two-fold, twofold |
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| doubtful | (adjective) open to doubt or suspicion | Synonyms: dubious, dubitable, in question |
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| (adjective) fraught with uncertainty or doubt | Synonyms: dubious |
| (adjective) unsettled in mind or opinion | Synonyms: tentative |
| doubting | (adjective) marked by or given to doubt | Synonyms: questioning, sceptical, skeptical |
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| doughy | (adjective) having the consistency of dough because of insufficient leavening or improper cooking | Synonyms: soggy |
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| dour | (adjective) showing a brooding ill humor | Synonyms: dark, glowering, glum, moody, morose, saturnine, sour, sullen |
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| (adjective) stubbornly unyielding | Synonyms: dogged, persistent, pertinacious, tenacious, unyielding |
| (adjective) harshly uninviting or formidable in manner or appearance | Synonyms: forbidding, grim |
| 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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| malodourous | (adjective) having an unpleasant smell | Synonyms: ill-smelling, malodorous, stinky, unpleasant-smelling |
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| odourless | (adjective) having no odor | Synonyms: inodorous, odorless |
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| pelecypodous | (adjective) bivalve | Synonyms: lamellibranch, pelecypod |
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| redoubled | (adjective) become much greater in intensity or size or amount | - |
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| redoubtable | (adjective) inspiring fear | Synonyms: formidable, unnerving |
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| (adjective) worthy of respect or honor | - |
| 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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