| errant | (adjective) straying from the right course or from accepted standards | - |
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| (adjective) uncontrolled motion that is irregular or unpredictable | - |
| erratic | (adjective) liable to sudden unpredictable change | Synonyms: fickle, mercurial, quicksilver |
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| (adjective) likely to perform unpredictably | Synonyms: temperamental |
| (adjective) having no fixed course | Synonyms: planetary, wandering |
| errhine | (adjective) causing nasal discharge | - |
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| erring | (adjective) capable of making an error | Synonyms: error-prone |
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| erroneous | (adjective) containing or characterized by error | - |
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| errorless | (adjective) free from error | - |
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