opaque / unclear
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opaque
Not transparent; made in such a way that one cannot see through it. Synonymous with opaque.
Das Badezimmerfenster ist aus undurchsichtigem Glas, um die Privatsphäre zu wahren.
The bathroom window is made of opaque glass to preserve privacy.
The word is the opposite of 'durchsichtig' (transparent). 'Durchsichtig' itself comes from 'durch' (through) and 'Sicht' (sight/view). 'Undurchsichtig' therefore literally means that one cannot see through it.
Die Fensterfolie ist undurchsichtig und schützt vor neugierigen Blicken.
The window film is opaque and protects against prying eyes.
In its literal meaning, the adjective describes the property of physical materials. Typical nouns are 'Glas' (glass), 'Flüssigkeit' (liquid), 'Vorhang' (curtain), or 'Material' (material).
Die Wasserprobe war eine trübe, undurchsichtige Flüssigkeit.
The water sample was a cloudy, opaque liquid.
The figurative meaning is used for abstract things that are difficult to understand. When it is about 'Motive' (motives), 'Pläne' (plans), 'Geschäfte' (business dealings), or 'Regeln' (rules), it means 'unclear' or 'mysterious'.
Die Finanzierung des gesamten Projekts ist für Außenstehende sehr undurchsichtig.
The financing of the entire project is very unclear to outsiders.
clear
'klar' and 'undurchsichtig' can be opposites, both for objects and for information. 'klar' means: you can see through something well, or you can clearly understand what is meant. 'undurchsichtig' means either: you cannot see through something, or: something is hard to understand and does not seem open. They can be confused because both are also used figuratively. With glass or film, it is about seeing. With plans, rules, or explanations, it is about whether you can understand what is really going on.
Der Vertrag wirkt undurchsichtig, deshalb liest Maria ihn noch einmal genau.
The contract seems unclear, so Maria reads it carefully again.
Die Regeln für die Anmeldung sind jetzt klar formuliert.
The rules for registration are now clearly worded.