Not determined, imprecise, or not explained clearly: There are too many undefined words even in dictionaries as well as in other written and verbal presentations.

Some dictionaries tend to explain the meanings of words with another spelling of the same word that is being shown which too often results in undefined entries; for example, some dictionaries say, "a manicurist is someone who gives manicures" or "a manicurist is a person who manicures" which of course results in the term manicurist being undefined.