na-adjective
Describes a person, attitude, or behavior that is reactive rather than proactive; often contrasted with 能動的 (active).
Antonyms: 能動的
彼はいつも受動的で、自分から行動しない。
He is always passive and never takes action on his own.
受動的な学習ではなく、能動的な学習が大切だ。
Active learning is important, not passive learning.