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Oriented toward purpose and practicality, often in contrast to aesthetic or decorative. It describes something that is primarily meant to fulfill its function.
Die Möbel im Büro sind sehr functional, aber nicht besonders gemütlich.
The furniture in the office is very functional, but not especially comfortable.
'Functional' is a loanword from English. Although it looks foreign, it is declined like a normal German adjective when it stands before a noun.
Wir haben uns für eine sehr functionale Kücheneinrichtung entschieden.
We decided on a very functional kitchen setup.
The meaning depends strongly on the context. In design or technology, it means 'zweckmäßig' (practical/fit for purpose). In a medical context, it describes a disorder without an identifiable organic cause.
Die Architektur des Gebäudes ist eher functional als schön.
The architecture of the building is more functional than beautiful.
In its main meaning, 'functional' is often used for objects where practical use is the main focus. Typical combinations are 'functionale Möbel' (functional furniture), 'functionale Kleidung' (functional clothing), or 'functionales Design' (functional design).
Für die Wanderung brauche ich vor allem functionale Kleidung.
For the hike, what I need most is functional clothing.
The medical meaning is specific technical language. You hear or read this term almost only in conversations with doctors or in medical reports.
Bei functionalen Beschwerden findet man keine strukturelle Schädigung des Organs.
With functional complaints, no structural damage to the organ is found.
practical / virtually
'praktisch' and 'functional' both describe things that are well suited for a purpose. 'praktisch' is the normal German word and fits in many everyday situations when something is useful, convenient, or practical. 'functional' is an English loanword and sounds more specialized. It is used more when you want to emphasize that a design or object is primarily meant to fulfill its function and does not have to be beautiful or decorative. In normal German, 'praktisch' is usually more natural.
Das neue Regal sieht schlicht aus, ist aber sehr functional.
The new shelf looks simple, but it is very functional.
Diese kleine Tasche ist auf Reisen sehr praktisch.
This small bag is very practical for traveling.