Intelligent, more intelligent, the most intelligent; tall, taller, the tallest; bad, worse, the worst; dangerous, more dangerous, the most dangerous; hot, hotter, the hottest; nice, nicer, the nicest; interesting, more interesting, the most interesting; little, less, the least; messy, messier, the messiest; expensive, more expensive, the most expensive
more intelligent - более разумный , более интелегентный
most intelligent -наиболее (самый)
разумный ,наиболее (самый) интелегентный