Foul place is a term used to describe an area that is dirty, unhygienic or unpleasant to be in. There are several synonyms that can be used to replace this phrase depending on the context. Words like filthy, unsanitary, contaminated, and putrid can be used to describe areas that are unclean or have a strong unpleasant smell. Other synonyms that can be used include nauseating, repulsive, and vile. These words are often used to paint a vivid picture of a location when describing it to someone. It is important to note that the use of such descriptive words depends on the intended audience and the level of offense it may cause.