assuredly
词根词缀：
assure v. 保证；确信
as 加强 + sure 肯定 → 一再肯定 → 确信
assurance n. 保证
as 表加强 + sur 肯定；安全 + ance 表状态 → 保证
assuredly adv. 无疑地
as 表加强 + sur 肯定；安全 + ed 表形容词 + ly …地 → 无疑地
insure v. 保险；保证
in 使… + sur 肯定；安全 + e → 使安全 → 保险
insurance n. 保险
in 使… + sur 肯定；安全 + ance，insure 的名词 → 保险
reassure v. 使确信
re 一再 + assure 保证；确信 → 使确信
surety n. 保证；保证人
sur 肯定；安全 + ety 表状态 → 保证；保证人
数据来源：新东方英语词汇速记大全
相关例句：
In the first meeting, I was assuredly scared for his appearance.
初见面，我真被他的外表给吓到了。
We must, indeed, all hang together or, most assuredly, we shall all hang separately.
假使我们不团结在一起，我们将分开被绞死。
He is, assuredly, not alone in believing they will win
毫无疑问，不止他一个人认为他们会赢。
Without a release, life will almost assuredly bring you down.
缺少了放松，生活必定是令人失望的。
Lord, we really look to You that we may be full of light within and have Your word as a base to know assuredly that we have been saved, and may flow out Your life from within us.
主，我们实在仰望你叫我们里面满有亮光，也有你的话作凭据，真正知道自己得救了，也使我们每一个人里面是活的，能从里面流出你的生命来！
The grammar schools were assuredly not intended for the gentry alone.
语法学校不是单为贵族们开办的。