"Mumsy" is a colloquial term that often connotes a sense of dated, frumpy, or overly maternal appearance or behavior. Synonyms for "mumsy" might include words like dowdy, matronly, homely, old-fashioned, or unfashionable. Other terms that convey a similar sense of outdated or unfashionable style might include words like frumpy, frumpish, or frowzy. However, it's important to note that these terms can be especially hurtful or derogatory when aimed at women, as they often reinforce sexist and ageist stereotypes about what it means to be a "good" or "attractive" mother. Ultimately, it's best to avoid using such terms and instead focus on celebrating the many different forms of beauty and motherhood that exist in the world around us.