An effeminate person is someone who displays characteristics traditionally associated with femininity, such as gentleness and sensitivity. MILKSOP, Cissy, and SISSY are all terms used to describe an effeminate person. MILKSOP is a term that has been used since the 16th century to describe a weak, timid, or cowardly man. Cissy and SISSY are more modern terms, both of which are used to describe a man who is overly feminine in his behavior or mannerisms.