| rallentando | (adjective) (music) gradually decreasing in tempo | Synonyms: rit., ritardando, ritenuto |
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| random | (adjective) lacking any definite plan or order or purpose; governed by or depending on chance | - |
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| randomised | (adjective) set up or distributed in a deliberately random way | Synonyms: randomized |
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| randomized | (adjective) set up or distributed in a deliberately random way | Synonyms: randomised |
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| redolent | (adjective) having a strong pleasant odor | Synonyms: aromatic |
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| (adjective) serving to bring to mind | Synonyms: evocative, remindful, reminiscent, resonant |
| (adjective) (used with `of' or `with') noticeably odorous | Synonyms: smelling |
| 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 | - |
| ritardando | (adjective) (music) gradually decreasing in tempo | Synonyms: rallentando, rit., ritenuto |
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| sacerdotal | (adjective) associated with the priesthood or priests | Synonyms: hieratic, hieratical, priestly |
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| (adjective) of or relating to a belief in sacerdotalism | - |
| sadomasochistic | (adjective) of or relating to sadomasochism | - |
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| sardonic | (adjective) disdainfully or ironically humorous; scornful and mocking | Synonyms: snarky |
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| shadowed | (adjective) filled with shade | Synonyms: shadowy, shady, umbrageous |
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| shadowy | (adjective) lacking clarity or distinctness | Synonyms: dim, faint, vague, wispy |
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| (adjective) lacking in substance | Synonyms: wraithlike |
| (adjective) filled with shade | Synonyms: shadowed, shady, umbrageous |
| shakedown | (adjective) intended to test a new system under operating conditions and to familiarize the operators with the system | - |
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| standoffish | (adjective) lacking cordiality; unfriendly | Synonyms: offish |
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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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| sudorific | (adjective) inducing perspiration | Synonyms: diaphoretic |
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| synecdochic | (adjective) using the name of a part for that of the whole or the whole for the part; or the special for the general or the general for the special; or the material for the thing made of it | Synonyms: synecdochical |
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| synecdochical | (adjective) using the name of a part for that of the whole or the whole for the part; or the special for the general or the general for the special; or the material for the thing made of it | Synonyms: synecdochic |
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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 |
| tuxedoed | (adjective) dressed in a tuxedo | - |
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| unadoptable | (adjective) difficult to place in an adoptive home | - |
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| unadorned | (adjective) not decorated with something to increase its beauty or distinction | Synonyms: undecorated |
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| underdone | (adjective) insufficiently cooked | Synonyms: half-baked |
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| undoable | (adjective) impossible to achieve | Synonyms: unachievable, unattainable, unrealizable |
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| undocumented | (adjective) lacking necessary documents (as for e.g. permission to live or work in a country) | - |
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| undogmatic | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, latitudinarian, undogmatical |
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| undogmatical | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, latitudinarian, undogmatic |
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| undomestic | (adjective) not domestic or related to home | - |
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| undomesticated | (adjective) unaccustomed to home life | - |
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| (adjective) not domesticated | - |
| undone | (adjective) thrown into a state of disorganization or incoherence | Synonyms: unstuck |
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| (adjective) not fastened or tied or secured | - |
| (adjective) not done | - |
| (adjective) doomed to extinction | Synonyms: done for, ruined, sunk, washed-up |
| unendowed | (adjective) not equipped or provided | - |
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| unhazardous | (adjective) thought to be devoid of risk | Synonyms: risk-free, riskless |
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| unorthodox | (adjective) breaking with convention or tradition | - |
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| (adjective) independent in behavior or thought | Synonyms: irregular, maverick |
| unpardonable | (adjective) not admitting of pardon | - |
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| unshadowed | (adjective) not darkened or obscured by shadow | - |
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| widowed | (adjective) single because of death of the spouse | - |
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