I answered all their questions truthfully.

我如实地回答了他们的所有问题。

《柯林斯英汉双解大词典》

She answered all their questions truthfully.

她如实回答了他们的所有问题。

《牛津词典》

Fiers promised to testify fully and truthfully.

菲尔斯承诺毫无保留地、如实地作证。

《柯林斯英汉双解大词典》

Jack London's many stories truthfully explained just how hard it was to be a gold seeker in eighteen ninety-seven.

VOA: special.2009.02.11

I might speak from the bottom of my heart, or say things honestly and truthfully.

VOA: special.2010.07.11

Not stating things truthfully is a small price to pay for the big prize.

FORBES: White House Admits (Third Time) President Obama Fibbed On Sequester

Truthfully, almost all of my reading time goes into the blog you are now reading.

FORBES: What Do Stories Look Like? How the Cover of Fidelis Morgan's 'Unnatural Fire' Came to Be

Truthfully, the NFLPA could decertify and win more concessions than they will likely receive from mediation.

FORBES: Game Theory Of The NFL Negotiations: Expect More Extensions