Chinese Toolbox provides a great deal of flexibility when working with words. Unknown words appear in the Reader with all characters of a word underlined. Sometimes, a legitimate word in the dictionary appears out of context; the word doesn't fit the context of what you're reading. When this occurs, you may want to temporarily remove the word from the dictionary; it will reappear the next time you start Chinese Toolbox.
To temporarily remove a word from the Word Dictionary, ensure that the word you want to exclude is shown in the Word Dictionary window, then press Ctrl-T.