This is the 4649th most frequent German word.
unglücklich
Unhappy.
Here, 'unglücklich' conveys the speaker feeling unfortunate or in a state of discontent due to external circumstances.
Ich bin heute unglücklich, weil es den ganzen Tag geregnet hat.
I am unlucky today because it rained all day.
In this sentence, 'unglücklich' describes the nature of the event as unfortunate or lamentable.
Der unglückliche Vorfall hat alle überrascht.
The unfortunate incident surprised everyone.
Here, 'unglücklich' refers to an emotional state of unhappiness as reflected in the facial expression.