Frumpy/ˈfrʌmpi/ Definition 1 of 1Pro Tip 1/3Slight Insult Often used negatively to criticize a person's appearance or style. Despite her success, they described her as frumpy. Pro Tip 2/3Fashion Context Usually refers to clothing and overall personal style. His frumpy jacket did not impress at the fashion show. Pro Tip 3/3Subjective Term One person's 'frumpy' might be another's 'vintage'. be aware of personal taste. What you call frumpy, I call classic elegance.