adj. 25B6; adjective
an intelligent writer : CLEVER, bright, brilliant, quick-witted, quick on the uptake, smart, canny, astute, intuitive, insightful, perceptive, perspicacious, discerning; knowledgeable; able, gifted, talented; informal brainy.
an intelligent being : RATIONAL, higher-order, capable of thought.
intelligent machines : SELF-REGULATING, capable of learning, smart.