This is the 5874th most frequent Japanese word.
ほんと
"ほんと" means "really" or "truth."
In this sentence, 'ほんと' is used adverbially with the particle 'に', emphasizing the truthfulness or intensity of the statement.
ほんとにおいしいですね。
It's really delicious, isn't it?
Here, 'ほんと' is used as a noun, meaning 'truth,' questioning the authenticity of the matter.
これ、ほんとなの？
Is this true?
In this case, 'ほんと' acts adverbially before an adjective, stressing the sincerity of the expression 'interesting' in the context.