| causal | (adjective) involving or constituting a cause; causing | - |
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| causative | (adjective) producing an effect | - |
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| causeless | (adjective) having no cause or apparent cause | Synonyms: fortuitous, uncaused |
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| (adjective) having no justifying cause or reason | Synonyms: reasonless |
| caustic | (adjective) of a substance, especially a strong acid; capable of destroying or eating away by chemical action | Synonyms: corrosive, erosive, mordant, vitriolic |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, sulfurous, sulphurous, virulent, vitriolic |