speak truthfully about sth
truthfully 修饰 speak，强调陈述内容真实。
She spoke truthfully about her experience.
她如实地讲述了自己的经历。
诚实地；如实地
真实地；如实地；坦诚地；诚实地；深信不疑地
with truth; in a truthful way
真实地；如实地
In a truthful manner
坦诚地
Frankly.
Please answer the question truthfully; we need the facts.
请如实回答这个问题；我们需要事实。
用法提示：truthfully 作副词修饰动词 answer，表示“诚实地、如实”。
She truthfully admitted that she had forgotten the appointment.
她诚实地承认自己忘了那个约会。
用法提示：truthfully 修饰动词 admitted，强调所说的话是真实的。
He spoke truthfully about his past mistakes.
他如实讲述了自己过去的错误。
用法提示：truthfully 修饰动词 spoke，表示以真实、诚恳的方式说话。
truthfully 修饰 speak，强调陈述内容真实。
She spoke truthfully about her experience.
她如实地讲述了自己的经历。
answer truthfully 是常见搭配，表示如实回答。
He answered the judge's questions truthfully.
他如实地回答了法官的问题。
truthfully 置于句首作评注性状语，表达说话人坦诚。
Truthfully, I don't know what happened.
说实话，我不知道发生了什么。
与此义最接近，多数语境可互换；但 honestly 常作句首语气词‘说实话’，此时不含对事实的保证。
强调坦率直言、不回避观点，常用于表达个人看法；未必像 truthfully 那样侧重陈述与事实相符。
强调公开坦白、说出真实想法，语域较正式，常见于访谈或书面回答。
在 tell/speak truly 等表达中可替代 truthfully，但更常作强调‘真正地’用，如 I'm truly sorry，需依句型判断。
grammar · medium
易错句子He told me the news truthful.
正确表达He told me the news truthfully.
修饰动词 told 应用副词 truthfully，而不能用形容词 truthful，因为形容词不能修饰动词。
grammar · medium
易错句子She was truthfully with me.
正确表达She was truthful with me.
系动词 was 后作表语应用形容词 truthful，而不能用副词 truthfully，因为副词不能作主语补足语。
本组反义词对应“诚实地、如实地”（with truth）义，另一义“深信不疑地”不适用。
指有意不诚实、不正直，与“诚实地”相对。
直接反义，指所说并非实情。
指在态度或情感上不表里如一，与“诚实地”相对。
truthfully 强调说话或表达时诚实、如实；truly 强调真实程度或确实性。
truthfully 是副词修饰动作；truthful 是形容词描述人或回答具有诚实性质。
truthfully 是副词，truth 是名词，表示所说内容本身，常用于 tell the truth。
诚实地说话
Please speak truthfully about what happened.
请如实说明发生的事。
如实回答
She answered truthfully when asked about her whereabouts.
被问及行踪时，她如实回答了。
坦诚承认
He truthfully admitted his mistake.
他坦诚承认了自己的错误。
如实报道
The journalist truthfully reported the facts.
记者如实报道了事实。
如实作证
Witnesses must testify truthfully in court.
证人在法庭上必须如实作证。
truth（真实） + -ful（充满…的） + -ly（副词后缀）
Dictionary facts from ECDICT, WIKTIONARY.