Expresses regret or disappointment that something undesirable is true or that something desired is not the case.
example
Leider muss ich Ihnen mitteilen, dass der Flug gestrichen wurde.
Unfortunately, I have to inform you that the flight has been canceled.
Usage tips
Word family
The word 'leider' is related to the noun 'das Leid' (pain, sorrow). It expresses that a piece of information is regrettable or 'painful.'
EXAMPLE
Ich kann morgen leider nicht kommen.
Unfortunately, I can't come tomorrow.
Word order
Like many adverbs, 'leider' can stand in different places in a sentence. If it is in position 1, the verb follows directly after it. It can also stand after the verb.
EXAMPLE
Leider hat es den ganzen Tag geregnet.
Unfortunately, it rained all day.
As a short answer
'Leider' is often used in short answers to express regret, often together with 'ja' (yes) or 'nein' (no).
EXAMPLE
Kommst du heute Abend mit ins Kino? - Leider nein, ich habe keine Zeit.
Are you coming to the movies with us tonight? - Unfortunately not, I don't have time.
Compare with
antonym
leider vs Dank
thanks
'leider' and 'Gott sei Dank' are opposites in many situations. With 'leider', you say that something is bad, unwanted, or disappointing. With 'Gott sei Dank' (thank God), you express relief because something turned out well or something bad did not happen. So this is not about gratitude in the normal sense, but about the fixed expression. Put simply: use 'leider' for bad news, and 'Gott sei Dank' when expressing relief.
leider
Leider ist der Bus schon abgefahren.
Unfortunately, the bus has already left.
Dank
Gott sei Dank hat die Ärztin heute noch einen Termin frei.
Thank God the doctor still has an appointment available today.