本当(ほんとう)

ほんとう
noun
truth, reality
See also: ほんと (casual form)
1. truth, reality
What is true or real, as opposed to what is false or imaginary.
本当(ほんとう)ですか。
Is that true? / Really?
Very common expression of surprise or confirmation
それは本当(ほんとう)の話(はなし)です。
That's a true story.
Please tell me the truth.
2. really, truly (adverbial use)
Used adverbially to emphasize sincerity or confirm something is true.
本当(ほんとう)にすみません。
I'm really sorry.
本当(ほんとう)においしいです。
It's really delicious.
本当(ほんとう)にありがとうございます。
Thank you so much. (Really, thank you.)

本当(ほんとう) means 'truth' as a noun, but is very commonly used adverbially and in set expressions.

Common expressions

Forms

COMMON COLLOCATIONS (as modifier):
本当(ほんとう)の + noun = real/true ~

Usage

本当(ほんとう)ですか can express either genuine inquiry or surprise, depending on intonation.