Opportunistic criminals are those who take advantage of any situation that presents itself as an opportunity for them to commit a crime. Some synonyms for opportunistic criminals can include "fence-sitters," "predators," and "chance-takers." Other related words include "nefarious," "unscrupulous," and "dishonest." Opportunistic criminals may also be referred to as "thieves," "robbers," or "burglars," depending on the type of crime they are committing. Regardless of what they are called, these criminals pose a serious threat to society and must be apprehended and brought to justice. It is important for people to be vigilant and take measures to protect themselves and their property from opportunistic criminals.