effective的否定字首是

否定字首是: no，構成noneffective

n. 無效無戰鬥力

adj. 無效的無戰鬥力的

So the regeneration of high loading rate sludge was noneffective.

對於高負荷汙泥的再生是無效的。Humour is a more effective defence than violence.

幽默是比暴力更有效的防禦武器。

Television is an effective means of communication.

電視是一種有效的通訊手段。

He has now taken effective control of the country.

他目前已有效地控制了這個國家。