1. A topic, issue, or subject that has not been talked about or debated
The undiscussed matter of budget cuts was finally brought up at the meeting.
O assunto não discutido dos cortes orçamentários foi finalmente levantado na reunião.
2. Something left unaddressed or unresolved in conversation
There was an undiscussed matter between them that created tension.
Havia um assunto não discutido entre eles que criava tensão.