1. An activity or action that is uncommon, rare, or not typically seen; something out of the ordinary
The sudden construction work at midnight was an unusual activity that disturbed the neighbors.
A atividade inusitada da construção à meia-noite perturbou os vizinhos.
2. Behavior or conduct that deviates from what is expected or normal in a given context
His atividade inusitada of studying at 5 AM impressed his parents.
Sua atividade inusitada de estudar às 5 da manhã impressionou seus pais.