certain的前缀是un和后缀是ty，uncertainty 中文意思是n. 犹豫，无把握；拿不定的事，令人无把握的局面；紧张不安

They hoped the waiting and the uncertainty would wear down my resistance.他们希望这种等待和不确定性会削弱我的抵抗。

This uncertainty must be swept away.这种不确定性必须消除。