passé
No longer current, fashionable, or up to date; outdated or obsolete.
Die Idee, Briefe mit der Hand zu schreiben, ist für viele junge Leute völlig passé.
For many young people, the idea of writing letters by hand is completely passé.

passé
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No longer current, fashionable, or up to date; outdated or obsolete.
Die Idee, Briefe mit der Hand zu schreiben, ist für viele junge Leute völlig passé.
For many young people, the idea of writing letters by hand is completely passé.

The adjective 'passé' is used almost exclusively predicatively, meaning it comes after a verb such as 'sein' (to be). It is not placed before a noun and declined.
Diese Frisur ist mittlerweile total passé.
This hairstyle is now totally passé.
The word comes from French, which explains the special spelling with 'é' and the pronunciation. It often gives a statement a somewhat more elegant tone.
Die Zeiten, in denen man Kassetten hörte, sind längst passé.
The days when people listened to cassettes are long passé.
'Passé' is often combined with adverbs that intensify its meaning, for example 'längst passé' (long passé), 'völlig passé' (completely passé), or 'endgültig passé' (definitively passé).
Seit es Smartphones gibt, sind Stadtpläne aus Papier für viele völlig passé.
Since smartphones have existed, paper city maps are completely passé for many people.
current
'aktuell' and 'passe' are clear opposites. 'aktuell' describes something that is important, valid, or up to date now. 'passe' means that something is no longer current or modern. It often sounds somewhat elevated or deliberately stylish. You use 'aktuell', for example, for topics, news, or information from the present. 'passe' fits better when you want to say that a fashion, an idea, or an old rule is outdated.

Diese alten Ausreden sind inzwischen passe.
These old excuses are passé by now.
Die aktuelle Liste der Termine liegt auf dem Schreibtisch.
The current list of appointments is on the desk.