| chalky | (adjective) composed of or containing or resembling calcium carbonate or calcite or chalk | Synonyms: calcareous |
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| (adjective) of something having the color of chalk | - |
| challengeable | (adjective) capable of being challenged | - |
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| challenging | (adjective) requiring full use of your abilities or resources | Synonyms: ambitious |
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| (adjective) disturbingly provocative | Synonyms: intriguing |
| (adjective) stimulating interest or thought | Synonyms: thought-provoking |
| chalybeate | (adjective) containing or impregnated with or tasting of iron | - |
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