
funktionierend
functioning
In a state in which something works as it should; intact and ready for use.
Wir brauchen eine funktionierende Heizung, bevor der Winter kommt.
We need a functioning heating system before winter comes.
functioning
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functioning
In a state in which something works as it should; intact and ready for use.
Wir brauchen eine funktionierende Heizung, bevor der Winter kommt.
We need a functioning heating system before winter comes.

functioning
Describes a system, relationship, or society that works successfully and without major problems.
Eine funktionierende Demokratie erfordert die aktive Teilnahme ihrer Bürger.
A functioning democracy requires the active participation of its citizens.
'Funktionierend' (functioning) is the present participle of the verb 'funktionieren' (to function / to work). It is used like a normal adjective and declined before a noun.
Ein funktionierendes Team ist der Schlüssel zum Erfolg.
A functioning team is the key to success.
This adjective is almost always used attributively, that is, directly before a noun. Predicative use, e.g. 'Die Heizung ist funktionierend.' (The heating is functioning), is rare and sounds unnatural.
Ich suche ein altes, aber noch funktionierendes Radio.
I'm looking for an old but still functioning radio.
In the technical meaning, it describes devices and machines. Typical combinations are 'eine funktionierende Bremse' (a functioning brake), 'ein funktionierendes Gerät' (a functioning device), or 'ein funktionierendes Netzwerk' (a functioning network).
Ohne eine funktionierende Kaffeemaschine fängt der Tag schlecht an.
Without a functioning coffee machine, the day gets off to a bad start.
In the figurative meaning, it describes complex systems. Common combinations are 'eine funktionierende Wirtschaft' (a functioning economy), 'eine funktionierende Gesellschaft' (a functioning society), or 'eine funktionierende Partnerschaft' (a functioning partnership).
Eine offene Kommunikation ist die Basis für eine funktionierende Beziehung.
Open communication is the basis for a functioning relationship.
stable
When describing a relationship, stabil refers to a settled state without any imminent sudden changes. Funktionierend, by contrast, means that living together or working together proceeds successfully and without major problems. A relationship can therefore be stable without functioning well in every respect.

Durch klare Absprachen führen sie eine funktionierende Beziehung.
Clear agreements help them maintain a functioning relationship.
Auch nach dem Streit bleibt ihre Beziehung stabil.
Their relationship remains stable even after the argument.