A Japanese friend asked me this:
When I want to say that someone has influenced me, I can say "influenced by". When I am skeptical of someone or doubtful of someone, I can say, "skeptical of" and "doubtful of". Since "doubtful" and "skeptical" are both adjectives, would it be possible for me to say "I am influential of you"? I think you can because the word "influential" is an adjective."
Basically he is trying to ask me if "I am influenced by you" is the same as "I am influential of you". Although I have never really heard the latter phrase before, my friend seems to have a point with this one.
Even if it's not heard in professional writings or speech, do you think it could be used in a colloquial way?