intelligential
in·tel·li·gent
I0178400 (ĭn-tĕl′ə-jənt)These adjectives mean having or showing mental keenness. Intelligent usually implies the ability to cope with new problems and to use the power of reasoning and inference effectively: The company put its most intelligent engineers to work on rectifying the design flaw. Bright implies quickness or ease in learning: She was a bright student who was soon at the head of the class. Brilliant suggests unusually impressive mental acuteness: "The dullard's envy of brilliant men is always assuaged by the suspicion that they will come to a bad end" (Max Beerbohm).
Smart refers to quick intelligence and often a ready capability for taking care of one's own interests: You were smart to buy your house when prices were low. Intellectual implies the capacity to grasp difficult or abstract concepts: The former professor was the more intellectual candidate.