Reply, Answer
noun, verbal noun
You gotta believe it will return. What are you believing in returning? The reply. You made a request for something (come up with something you want really bad but have to ask for). Now you wait for the reply.
へんしん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
いや、まだ返信してない。
No, I haven't replied yet.
いつまでたっても返信が来ないんだよね。
It's taking forever to get a reply.
返信したつもりだったんだけど、送信できてなかった。
I thought I replied, but it turns out it didn't send.