frumpy

/ˈfrʌmpi/
adjective
  1. Dull, old-fashioned, and unstylish, especially in clothing or appearance.
    • His frumpy sweater and baggy pants made him seem much older.
    • The hotel lobby had a frumpy, outdated decor that needed renovation.
    • She wore a frumpy dress that looked like it was from the 1950s.
Synonyms
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