Slimebags, as a term, has many synonyms that are less harsh and may be more appropriate in certain situations. For instance, one might use the term "deceitful" or "duplicitous" to describe someone who is dishonest or untrustworthy. "Sly" and "crafty" are also alternative terms used to describe someone who is sneaky. Another possible term is "unsavory," which can also be used to describe an unpleasant character of personality. "Shady" and "sketchy" are also great alternatives that could be used instead of "slimebags." It is essential to choose the right term that suits the situation and conveys the intended message without sounding offensive.