
durchsichtig
transparent
Made in such a way that you can see through it; transparent. Light can pass through the material largely unhindered.
Die Wasserflasche ist aus durchsichtigem Plastik.
The water bottle is made of transparent plastic.
transparent
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transparent
Made in such a way that you can see through it; transparent. Light can pass through the material largely unhindered.
Die Wasserflasche ist aus durchsichtigem Plastik.
The water bottle is made of transparent plastic.

transparent / obvious
Easy to see through or understand, so that the true intention or true character is recognizable; obvious.
Ihre Ausrede war so durchsichtig, dass ihr niemand glaubte.
Her excuse was so transparent that no one believed her.
The adjective is made up of 'durch' (through) and 'sichtig' (from 'Sicht', view/sight). So it literally means that a view 'through' something is possible. This logic applies to both the concrete and the figurative meaning.
Das Fenster ist so sauber, es ist fast unsichtbar.
The window is so clean, it's almost invisible.
Whether the literal or figurative meaning is intended depends on the noun. If the adjective describes a material or object, it is meant literally. If it describes an idea, an action, or a statement, it is meant figuratively.
Seine Argumentation war nicht sehr überzeugend und ziemlich durchsichtig.
His argument was not very convincing and quite transparent.
In the literal meaning, 'durchsichtig' (transparent) is often combined with materials. Typical examples are 'durchsichtiges Glas' (transparent glass), 'durchsichtige Folie' (transparent film), or 'durchsichtiges Wasser' (clear water).
Die Dokumente sind in einer durchsichtigen Hülle geschützt.
The documents are protected in a transparent sleeve.
In the figurative meaning, 'durchsichtig' (transparent/obvious) usually describes abstract things. Common combinations are 'eine durchsichtige Lüge' (a transparent lie), 'ein durchsichtiger Plan' (a transparent plan), or 'ein durchsichtiges Manöver' (a transparent maneuver).
Sein Versuch, uns zu täuschen, war ziemlich durchsichtig.
His attempt to deceive us was quite transparent.
clear
When talking about material that you can see through, both klar and durchsichtig are often possible. klar focuses more on the clear, non-cloudy impression, while durchsichtig explicitly refers to the possibility of seeing through something. Use „durchsichtig“ when actually being able to see through the material is important.

Die Flasche ist durchsichtig, sodass man den Wasserstand von außen sehen kann.
The bottle is transparent, so you can see the water level from the outside.
Das Wasser im See ist heute so klar, dass die Steine am Grund sichtbar sind.
The water in the lake is so clear today that you can see the stones on the bottom.