fortunately
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fortunately
Expresses that a circumstance or event is perceived as fortunate, positive, or advantageous; luckily.
Ich hatte meinen Regenschirm vergessen, aber glücklicherweise hat es nicht geregnet.
I had forgotten my umbrella, but fortunately it didn't rain.
The adverb is made up of 'glücklicher' (comparative of glücklich, happy/fortunate) and 'Weise' (way or manner). So it literally means 'in a fortunate way or manner'.
Er löste das Problem auf seine eigene Weise.
He solved the problem in his own way.
When 'glücklicherweise' (fortunately) is at the beginning of the sentence (position 1), the conjugated verb follows immediately. When it is inside the sentence, it does not change the normal word order.
Glücklicherweise habe ich den Zug noch erwischt.
Fortunately, I still caught the train.
This word is a sentence adverb. That means it comments not just on a single word, but evaluates the entire statement of the sentence from the speaker's perspective as positive or as a lucky event.
Die Prüfung wurde glücklicherweise verschoben, so hatte ich mehr Zeit zum Lernen.
The exam was fortunately postponed, so I had more time to study.
unfortunately
'leider' and 'glücklicherweise' both comment on a situation. They show how you evaluate that situation. You use 'leider' when something is too bad, unpleasant, or disappointing. You use 'glücklicherweise' when something turned out well or creates an advantage. So the words are clear opposites: 'leider' fits bad news, while 'glücklicherweise' fits good news.
Glücklicherweise ist bei der Bewerbung alles rechtzeitig angekommen.
Fortunately, everything for the application arrived on time.
Vor dem Termin hat die Gruppe leider nicht genug Geld gesammelt.
Unfortunately, the group did not collect enough money before the appointment.