na-adjective
Used as a na-adjective to describe a passive attitude, state, or characteristic, often in contrast to アクティブ.
彼はパッシブな態度で会議に参加した。
He participated in the meeting with a passive attitude.
パッシブな学習よりアクティブな学習のほうが効果的だ。
Active learning is more effective than passive learning.