The term 'Makes Impossible' can be summarized by three crossword solutions: PRECLUDES (9 letters), forbids (7 letters), and BANS (4 letters). PRECLUDES means to prevent something from happening or being done, while forbids means to prohibit something from happening or being done. BANS are similar to forbids, but are usually more severe and are often legally enforced. All three words imply that something is not allowed or cannot be done.