Mis-deem means to wrongly judge someone or something. It is a term that has been used in language for a long time and is often connected with an error of judgement. Some synonyms for the word mis-deem include misconceive, misinterpret, and misjudge. All of these words share the same meaning, but they are used in different contexts. Other synonyms include misthink, misreckon, and miscalculate. These words indicate that someone has made a mistake in their judgement. Whether it's due to incorrect information or an emotional bias, the result is the same: a misdeed of judgement or perception.