In those sentences, I would assume fearful to mean that he is scared. If it meant he scares people, I would think the word fearsome should be used, or just scary.
I’m not sure about this, but I think that when we are talking about people or animals that are capable of feeling emotion, fearful usually means scared. When it is applied to nouns for abstract or inanimate things, then it usually means scary.
However, a Google search shows me some cases where fearful can mean scary even when applied to an animate noun. These appear to be limited in number, and are generally fixed, archaic-sounding phrases, such as “a fearful master”, “a fearful zealot”, etc. They seem to apply to people who are scary in general and to everybody, rather than in one specific instance.