(ほんとう)

ほんとう
noun
truth, reality
1. truth, reality
What is true or real, as opposed to what is false or imaginary.
本当(ほんとう)です
Is that true? / Really?
Very common expression of surprise or confirmation
それ本当(ほんとう)(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)すみません
I'm really sorry.
本当(ほんとう)おいしいです
It's really delicious.
本当(ほんとう)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:

CASUAL FORMS:

  • ほんと?: Really? (casual)
  • ほんとに: Really (casual adverb)
  • マジ?: Seriously? (slang, similar meaning)

USAGE AS MODIFIER:

本当(ほんとう) + noun = real/true ~

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