
unglücklich
unhappy
Experiencing a state of sadness, grief, or emotional suffering.
Er ist schon seit Wochen unglücklich, weil er seinen Job verloren hat.
He has been unhappy for weeks because he lost his job.
unhappy / unfortunate
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unhappy
Experiencing a state of sadness, grief, or emotional suffering.
Er ist schon seit Wochen unglücklich, weil er seinen Job verloren hat.
He has been unhappy for weeks because he lost his job.

unfortunate
Caused by chance or bad luck; due to unfortunate circumstances.
Sie ist auf der Treppe unglücklich gestürzt und hat sich den Arm gebrochen.
She had an unfortunate fall on the stairs and broke her arm.

unfortunate
Inappropriate, clumsy, or leading to a bad result. Often refers to a choice, a formulation, or an action.
Seine Bemerkung über ihr Kleid war wirklich eine unglückliche Wortwahl.
His comment about her dress was really an unfortunate choice of words.
The word is the opposite of 'glücklich' (happy). The prefix 'un-' is frequently used in German to express negation or the opposite.
Sie war mit der Entscheidung sichtlich unglücklich.
She was visibly unhappy with the decision.
The meaning changes depending on the sentence structure. If it describes a person's feeling ('sie ist unglücklich' — she is unhappy), it means 'sad'. If it describes an action ('sie ist unglücklich gefallen' — she fell unfortunately), it means 'through bad luck'. If it stands before a noun ('eine unglückliche Wahl' — an unfortunate choice), it means 'inappropriate'.
Er ist unglücklich in seine beste Freundin verliebt.
He is unhappily in love with his best friend.
If you want to name the reason for the sadness, you often use the preposition 'über' (about/over) followed by the accusative.
Die Mannschaft war unglücklich über die knappe Niederlage.
The team was unhappy about the narrow defeat.
In the meaning 'inappropriate' or 'clumsy', the word is often combined with nouns like 'Wahl' (choice), 'Formulierung' (wording/formulation), 'Entscheidung' (decision), or 'Zufall' (coincidence).
Es war eine unglückliche Entscheidung, das Projekt abzubrechen.
It was an unfortunate decision to cancel the project.
sad
Traurig directly describes a feeling of sorrow or dejection. Unglücklich can express the same emotional suffering, but it often sounds more comprehensive and refers more to lasting dissatisfaction or a lack of happiness in life. Traurig usually fits an immediate reaction, while unglücklich is more suitable for a situation that has lasted longer.

Seit Monaten ist Lea in ihrem neuen Leben unglücklich und sucht nach einer Veränderung.
Lea has been unhappy with her new life for months and is looking for a change.
Nach dem Streit war Lea traurig und wollte zunächst allein sein.
After the argument, Lea was sad and initially wanted to be alone.