好听

pleasant to hear; nice to listen to; pleasant-sounding; melodious; musical; sweet-sounding; euphonious

复杂

complex; involved; mixed; complicated; busy; fancy; murky; high; intricate; sophisticated; knotty; convoluted; elaborate; tangled; cumbersome; heavy-duty; tortuous; prickly; wonky; complexity; intricacy; sophistication; complicate