Sophisticated means complex, refined, or showing a deep understanding of how things work. A sophisticated machine like a smartphone contains countless tiny parts working together in intricate ways. A sophisticated joke requires you to understand several ideas at once to get why it's funny. A sophisticated problem needs careful thought because simple solutions won't work.

When describing people, sophisticated means worldly and cultured: someone who knows about art, good food, different cultures, or complex ideas. A sophisticated traveler visits famous landmarks and also learns about local customs and history. A sophisticated reader enjoys books with layered meanings and subtle themes, finding richness in stories that reward careful attention.

The word can also describe taste and style. Sophisticated clothes might be elegant and understated rather than flashy. A sophisticated restaurant serves carefully prepared dishes with interesting flavors, creating memorable dining experiences.

Today, sophisticated usually means impressively complex or refined. When your science teacher says your experiment was sophisticated, she means you thought deeply about the problem and created something genuinely clever. The opposite of sophisticated might be simple, basic, or naive.