| crucial | (adjective) of extreme importance; vital to the resolution of a crisis | Synonyms: important |
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| (adjective) of the greatest importance | Synonyms: all-important, all important, essential, of the essence |
| (adjective) having crucial relevance | - |
| cruciate | (adjective) shaped like a cross | Synonyms: cruciform |
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| cruciferous | (adjective) of or relating to or belonging to the plant family Cruciferae | - |
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| cruciform | (adjective) shaped like a cross | Synonyms: cruciate |
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| cruddy | (adjective) characterized by obscenity | Synonyms: filthy, foul, nasty, smutty |
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| crude | (adjective) not refined or processed | Synonyms: unprocessed, unrefined |
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| (adjective) belonging to an early stage of technical development; characterized by simplicity and (often) crudeness | Synonyms: primitive, rude |
| (adjective) conspicuously and tastelessly indecent | Synonyms: earthy, gross, vulgar |
| (adjective) not processed or subjected to analysis | Synonyms: raw |
| (adjective) devoid of any qualifications or disguise or adornment | Synonyms: blunt, stark |
| (adjective) not carefully or expertly made | Synonyms: rough |
| cruel | (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: barbarous, brutal, fell, roughshod, savage, vicious |
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| crumbly | (adjective) easily broken into small fragments or reduced to powder | Synonyms: friable |
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| crummy | (adjective) of very poor quality; flimsy | Synonyms: bum, cheap, cheesy, chintzy, punk, sleazy, tinny |
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| crumpled | (adjective) of metal e.g. | Synonyms: bent, dented |
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| crural | (adjective) of or relating the leg from the knee to the foot | - |
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| crushed | (adjective) subdued or brought low in condition or status | Synonyms: broken, humbled, humiliated, low |
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| (adjective) treated so as to have a permanently wrinkled appearance | - |
| crushing | (adjective) physically or spiritually devastating; often used in combination | Synonyms: devastating |
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| crustacean | (adjective) of or belonging to the class Crustacea | Synonyms: crustaceous |
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| crustaceous | (adjective) being or having or resembling a hard crust or shell | - |
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| (adjective) of or belonging to the class Crustacea | Synonyms: crustacean |
| crustal | (adjective) of or relating to or characteristic of the crust of the earth or moon | - |
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| crusted | (adjective) having a hardened crust as a covering | Synonyms: crustlike, crusty, encrusted |
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| crustlike | (adjective) having a hardened crust as a covering | Synonyms: crusted, crusty, encrusted |
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| crustose | (adjective) (of lichens) having a thin crusty thallus that adheres closely to the surface on which it is growing | - |
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| crusty | (adjective) having a hardened crust as a covering | Synonyms: crusted, crustlike, encrusted |
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| (adjective) brusque and surly and forbidding | Synonyms: curmudgeonly, gruff, ill-humored, ill-humoured |