tückisch
treacherous
The German word "tückisch" is an adjective meaning "treacherous," "deceitful," or "insidious." It implies a sort of malicious or hidden danger that is not immediately apparent. In the context of illness, "tückisch" can denote a disease that doesn't show its symptoms openly or that can suddenly worsen. There's no prefix in the word "tückisch."
Similar words that convey the meaning of deceit or hidden threat include "hinterhältig" (sneaky), "heimtückisch" (insidious, perfidious), and "trügerisch" (deceptive).
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Examples
Diese Prüfung ist besonders tückisch.adjective
This exam is particularly treacherous.
Der Plan scheint tückisch zu sein.adjective
The plan seems to be treacherous.
Vorsicht, das Gelände ist tückisch.adjective
Be careful, the terrain is treacherous.
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