
raffiniert
clever
Very smart, well thought out, and clever in a subtle or sharp-witted way; often also cunning or tricky.
Sie hat einen raffinierten Plan entwickelt, um das Problem zu lösen.
She developed a clever plan to solve the problem.
clever / sophisticated / refined
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clever
Very smart, well thought out, and clever in a subtle or sharp-witted way; often also cunning or tricky.
Sie hat einen raffinierten Plan entwickelt, um das Problem zu lösen.
She developed a clever plan to solve the problem.

sophisticated
Elegant, tasteful, and designed with special finesse; refined and not ordinary.
Das Kleid hatte einen raffiniert gestalteten Rückenausschnitt.
The dress had a sophisticatedly designed back neckline.

refined
Refers to foods or raw materials that have been purified through technical processes and freed from unwanted substances.
Für den Kuchen sollte man raffiniertes Pflanzenöl verwenden.
You should use refined vegetable oil for the cake.
'Raffiniert' (clever/sophisticated/refined) is the past participle of the verb 'raffinieren' (to refine or purify), which means 'veredeln' (to refine/enhance) or 'reinigen' (to clean/purify). This basic idea appears in all meanings: a plan is 'veredelt' (made cleverer), a design is 'veredelt' (made more elegant), and a raw material is 'gereinigt' (purified).
Das Unternehmen nutzt ein spezielles Verfahren, um das Rohöl zu raffinieren.
The company uses a special process to refine the crude oil.
The noun that 'raffiniert' (clever/sophisticated/refined) describes reveals the meaning. If it is about plans or tricks, it means 'klug' (clever). If it is about design or art, it means 'elegant' (elegant). If it is about foods like sugar or oil, it means 'industriell gereinigt' (industrially refined).
Ihr raffinierter Schachzug überraschte alle.
Her clever move surprised everyone.
In the meaning 'klug' (clever) or 'listig' (cunning), 'raffiniert' (clever) is often combined with abstract nouns such as 'Plan' (plan), 'Methode' (method), 'System' (system), or 'Trick' (trick).
Der Dieb hatte einen raffinierten Plan, um die Alarmanlage auszuschalten.
The thief had a clever plan to turn off the alarm system.
When 'raffiniert' means 'elegant' (elegant) or 'anspruchsvoll' (sophisticated), it often describes things like 'Design' (design), 'Details' (details), 'Kleidung' (clothing), or also 'Gerichte' (dishes) and 'Geschmack' (taste/flavor).
Das Dessert war eine raffinierte Komposition aus Schokolade und Früchten.
The dessert was a sophisticated composition of chocolate and fruit.
In the technical sense, 'raffiniert' (refined) almost always describes industrially processed raw materials. The most common collocations are 'raffinierter Zucker' (refined sugar) and 'raffiniertes Öl' (refined oil).
Viele verarbeitete Lebensmittel enthalten raffinierten Zucker.
Many processed foods contain refined sugar.
clever
Clever and raffiniert can both describe an intelligent solution or approach. Clever emphasizes practical usefulness, while raffiniert additionally suggests something subtle, artful, or sometimes cunning. Clever is enough for a simple good idea; raffiniert often fits a sophisticated trick.

Mit einem raffinierten Plan lenkte sie unauffällig alle von ihrem eigentlichen Ziel ab.
With a sophisticated plan, she subtly distracted everyone from her real goal.
Ihr cleverer Plan brachte die Gruppe ohne Umweg ans Ziel.
Her clever plan got the group to their destination without taking a detour.