1. A day that is extremely tiring, draining, or depleting of physical or mental energy
After the conference, I had a completely exhausting day.
Após a conferência, tive um dia completamente exaustivo.
2. A day filled with demanding activities that leave one feeling worn out
It was an exhausting day at work with back-to-back meetings.
Foi um dia exaustivo no trabalho com reuniões consecutivas.