| errancy | (noun) fallibility as indicated by erring or a tendency to err | - |
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| (noun) (Christianity) holding views that disagree with accepted doctrine; especially disagreement with papal infallibility | - |
| errand | (noun) a short trip that is taken in the performance of a necessary task or mission | - |
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| 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 |
| erratically | (adverb) in an erratic unpredictable manner | Synonyms: unpredictably |
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| erratum | (noun) a mistake in printed matter resulting from mechanical failures of some kind | Synonyms: literal, literal error, misprint, typo, typographical error |
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