1. Attributes, qualities, or functionalities that appear or occur in a manner not anticipated or foreseen
The software update introduced unexpected features that confused many users.
A atualização de software introduziu características inesperadas que confundiram muitos usuários.
2. Surprising or unforeseen aspects of something
The old house had unexpected features hidden behind the walls.
A casa antiga tinha características inesperadas escondidas atrás das paredes.