This is the 1863rd most frequent French word.
malheureusement
Unfortunately.
Here, 'malheureusement' introduces the speaker's regret about their inability to attend the party.
Malheureusement, je ne peux pas venir à votre fête demain.
Unfortunately, I can't come to your party tomorrow.
In this example, 'malheureusement' expresses disappointment due to the weather condition.
Malheureusement, il pleut trop pour sortir aujourd'hui.
Unfortunately, it's raining too much to go outside today.
The usage of 'malheureusement' conveys a sense of dismay regarding for the unavailability of an item.