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
Loading your saved state.
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.

'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.
smart / cunning
'schlau' and 'raffiniert' can both describe someone or something acting in a smart and skillful way. 'schlau' is more general and can be meant positively or in a slightly sly way. 'raffiniert' sounds stronger: a solution, plan, or trick is especially well thought out, finely crafted, and sometimes hard to see through. Learners may confuse the words because both have to do with cleverness. However, 'raffiniert' fits better when something is especially tricky or artfully planned, not just smart.

Ihr Plan war raffiniert, weil niemand sofort den Trick bemerkte.
Her plan was clever because no one noticed the trick right away.
Der Chef fand es schlau, den Termin auf den Vormittag zu legen.
The boss thought it was smart to schedule the appointment for the morning.