Frumpishly is an adjective that refers to someone or something that is unstylish, dowdy, or unfashionable in appearance or behavior. It can also describe a person's manner as drab, unkempt, old-fashioned or untidy. Synonyms for frumpishly include unattractively, sloppily, unglamorously, shabbily, scruffily, outmodedly, frowsily, frumpily and badly dressed. Such words can be used to describe someone's appearance, attitude or demeanor. For instance, instead of saying someone looks frumpishly, one could say they appear unkempt or are not well put together. In essence, there are various synonyms for frumpishly that can be used in different contexts depending on the situation.