Step 1: Analyze the logical operation.
For the logical OR operation \( p \vee q \), it is false when both \( p \) and \( q \) are false.
Step 2: Conclusion.
Thus, \( p \vee q \) is false when both \( p \) and \( q \) are false.
Final Answer:
\[
\boxed{both \, p \, and \, q \, are \, false}
\]