| calamitous | (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, disastrous, fatal, fateful |
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| calando | (adjective) (music) gradually decreasing in tempo and volume | - |
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| intercalary | (adjective) having a day or month inserted to make the calendar year correspond to the solar year: | - |
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| scalable | (adjective) capable of being scaled; possible to scale | - |
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| scalar | (adjective) of or relating to a directionless magnitude (such as mass or speed etc.) that is completely specified by its magnitude | - |
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| (adjective) of or relating to a musical scale | - |
| unscalable | (adjective) incapable of being ascended | Synonyms: unclimbable |
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