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English word dysfunctional comes from English functional, English dys- (Bad.)
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functional (English)
(computing) An object encapsulating a function pointer (or equivalent).. (mathematics) A function that takes a function as its argument; More precisely: A function y=f(x) whose argument x varies in a space of (real valued, complex valued) functions and whose value belongs to a monodimensional space. An example: the definite integration of integrable real functions in a real interval.. [...]
dys- (English)
Bad.
dysfunctional (English)
Functioning incorrectly or abnormally; especially, designating of a business, family or social group with harmful, aberrant, strange or abnormal behavior.. Not performing its proper or intended function.