そのじつ

(1) 現実において、または現実性で(in reality or actuality; "in fact, it was a wonder anyone survived"; "painters who are in fact anything but unsophisticated"; "as a matter of fact, he is several inches taller than his father")(in reality or actuality)

⇒実は、彼は父親より数インチ背が高い(in reality or actuality)

(2) 人が述べられた事実に対してその正反対であると予想するのを含意するために用いられる意外にも(used to imply that one would expect the fact to be the opposite of that stated; surprisingly; "you may actually be doing the right thing by walking out"; "she actually spoke Latin"; "they thought they made the rules but in reality they were only puppets"; "people who seem stand-offish are in reality often simply nervous")(used to imply that one would expect the fact to be the opposite of that stated)(surprisingly)

⇒冷淡に見える人々は実は単に神経質なだけである(surprisingly)

(3) 強意語として使われる(used as intensifiers; `real' is sometimes used informally for `really'; `rattling' is informal; "she was very gifted"; "he played very well"; "a really enjoyable evening"; "I'm real sorry about it"; "a rattling good yarn")(used as intensifiers)

⇒活発な面白い冒険談(used as intensifiers)

(4) 実は(in fact (used as intensifiers or sentence modifiers); "in truth, moral decay hastened the decline of the Roman Empire"; "really, you shouldn't have done it"; "a truly awful book")

⇒本当にひどい本(in fact)