There are several synonyms for the term "improper suggestion". This phrase can refer to a statement or proposal that is inappropriate, offensive, or lacking in morality. Some synonyms for this term include inappropriate suggestion, indecent proposal, offensive proposition, objectionable idea, unacceptable proposition, and immoral proposal. These phrases are all similar in meaning to "improper suggestion" and convey the negative connotations associated with such a statement. When communicating, it is important to carefully consider the language used and to avoid making proposals that are considered inappropriate or offensive. Choosing appropriate synonyms for these terms can help avoid misunderstandings or offense.