mysterious
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mysterious
Secretive, puzzling, and difficult to understand or explain.
Sein plötzliches Verschwinden unter mysteriösen Umständen gab der Polizei Rätsel auf.
His sudden disappearance under mysterious circumstances puzzled the police.
The adjective 'mysteriös' (mysterious) is closely related to the noun 'das Mysterium' (a mystery, a puzzle). The ending '-iös' is typical of adjectives that come from French or Latin.
Die Polizei untersucht den mysteriösen Tod des Millionärs.
The police are investigating the mysterious death of the millionaire.
'Mysteriös' (mysterious) can stand directly before a noun or be used with the verb 'sein' (to be) to describe a quality.
Ein mysteriöser Brief lag auf dem Tisch.
A mysterious letter was lying on the table.
The adjective is often used to describe unexplained events or things. Common combinations are 'mysteriöse Umstände' (mysterious circumstances), 'ein mysteriöser Fall' (a mysterious case), or 'eine mysteriöse Krankheit' (a mysterious illness).
Er erhielt einen mysteriösen Anruf von einer unbekannten Nummer.
He received a mysterious call from an unknown number.
clear
'klar' and 'mysteriös' are opposites here. You use 'klar' when something is easy to understand, unambiguous, or explainable. You use 'mysteriös' when something seems puzzling and cannot be explained easily. A plan, an answer, or a reason can be 'klar'. A noise, a behavior, or an event can be 'mysteriös' if you do not know what is behind it.
Im Keller hörte Frau Schmidt ein mysteriöses Geräusch.
Ms. Schmidt heard a mysterious noise in the basement.
Nach dem Gespräch war der Termin für alle klar.
After the conversation, the appointment was clear to everyone.