Opposition is a semantic relation in which one word has a sense or meaning that negates or is, in the sense of scale, distant from a related word. Other words are capable of being opposed, but the language in question has an accidental gap in its lexicon. For example, the word "devout" lacks a lexical opposite, but it is fairly easy to conceptualize a parameter of devoutness where "devout" lies at the positive pole with a missing member at the negative pole. Opposites of such words can nevertheless sometimes be formed with the prefixes "un-" or "non-", with varying degrees of naturalness. For example, the word "undevout" appears in Webster's dictionary of 1828, while the pattern of "non-person" could conceivably be extended to "non-platypus". Conversely, some words appear to be a prefixed form of an opposite, but the opposite term does not exist, such as "inept," which appears to be "in-" + *"ept;" such a word is known as an unpaired word.