Really

まじ

maji

(informally, as an intensifier; very, very much)

本当に

hontō ni

(actually)

へえ？

hē?

(indicating surprise at, or requesting confirmation of, some new information)

ほんと？

honto?

(indicating surprise at, or requesting confirmation of, some new information)

本当？

hontō?

(indicating surprise at, or requesting confirmation of, some new information)

本真に？

honma ni?

(indicating surprise at, or requesting confirmation of, some new information)