The word "implicit" means not directly stated or implied. In speeches and texts, this word is used to describe those ideas and concepts that are not directly stated by the author or writer but that are suggested by him or can be inferred based on the content of a text or speech; because of this, despite these ideas are not explicit in most cases they are understood by the audience as they use induction and deduction processes. Also, this type of ideas differs from explicit ideas because these are directly stated, form ethical ideas because these deal with ethic and from rhetorical because they aim at convincing the audience. Considering this, the type of ideas that are often understood by the audience even though they are not directly stated is implicit ideas.
C. From the looks of fear and distrust, he would have guessed that before long his arrival would be the talk of the whole town. He saw nothing of all this. People with trouble do not look behind.