本当に良かった

was really good; was really glad

→ 本当に
phrase Common #6,611
was really good; was really glad 良かった can describe something as good or express relief and happiness that something happened.
JA: 試験に合格して本当に良かった。
EN: I’m really glad I passed the exam.

怪我がなくて、本当に良かった。

I'm so glad you weren't hurt.

君と知り合えて本当に良かった

I'm really glad I got to know you.

— ムーンライズ・キングダム (2012)

成功して本当に良かったね。

I'm really glad it worked out for you.

昔は本当に良かったわね。

Things really were better back then.

あの映画、本当に良かったよ。

That movie was really good.

本当に良かった

I'm really glad.

— 善き人のためのソナタ (2006)