
vernünftig
reasonable
Guided by reason and good judgment; sensible and well considered.
Es wäre vernünftig, vor der langen Fahrt eine Pause zu machen.
It would be reasonable to take a break before the long drive.
reasonable / decent
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reasonable
Guided by reason and good judgment; sensible and well considered.
Es wäre vernünftig, vor der langen Fahrt eine Pause zu machen.
It would be reasonable to take a break before the long drive.

decent
In colloquial language, used for proper, decent, or of satisfactory quality.
Nach der Wanderung hatten alle einen vernünftigen Hunger.
After the hike, everyone had a decent appetite.
'Vernünftig' is derived directly from the noun 'die Vernunft' (reason, sense). Something that is 'vernünftig' is therefore guided by reason.
Er hat eine Entscheidung getroffen, die von Vernunft geprägt ist.
He made a decision shaped by reason.
'Vernünftig' is often used as advice or an appeal, especially in the form 'Sei vernünftig!' (Be reasonable!). It also often describes decisions, plans, or people.
Sei vernünftig und geh nicht allein im Dunkeln nach Hause!
Be reasonable and don't go home alone in the dark!
In colloquial language, 'vernünftig' often means 'ordentlich' (proper/decent), 'richtig' (real/proper), or 'ausreichend' (sufficient). It then describes a satisfactory quality or quantity.
Ich brauche mal wieder eine vernünftige Mütze für den Winter.
I need a decent hat for winter again.
healthy
Both words can express a positive assessment of an attitude or decision. “Gesund” describes more of a balanced, normal, or solid development, while “vernünftig” emphasizes a considered decision based on good judgment. Use “gesund” for a general assessment and “vernünftig” when giving the reasoning behind a decision.

Es ist vernünftig, vor der Entscheidung alle Kosten genau zu prüfen.
It is reasonable to examine all the costs carefully before making the decision.
Eine gesunde Mischung aus Arbeit und Erholung hilft ihr im Alltag.
A healthy balance of work and relaxation helps her in everyday life.