Many people believe that intelligence is an embodied phenomenon: one cannot be intelligent without having a body to interact with the environment. It is not definable at all.
Moreover, intelligence or looking intelligent (which in someone’s opinion might be the same) needs that all intelligent-looking process of interaction do their job well. If you are able to do many symbolic processing very fast, but you cannot speak at all (or in the way you want) or you understand what you are required to do, you are not considered intelligent by others. I guess in this situation, not only you are not “considered” intelligent, but also you are “not” intelligent at all!