1. A day that is dull, tedious, or lacking in interest or excitement
Yesterday was a boring day; I stayed home and did nothing productive.
Ontem foi um dia chato; fiquei em casa e não fiz nada produtivo.
2. A day characterized by unpleasant or annoying events
It was a boring day at work with too many meetings.
Foi um dia chato no trabalho com muitas reuniões.