doubter; person who is unwilling to believe something until he has examined the supporting evidence
I am, on principle, a skeptic, so don't be offended if I don't automatically accept whatever you tell me.
skeptikos (inquiring, reflective) (Greek)
Skeptic-just remove 'K' -Septic-When a person is Wonded/Injured he always have doubt whether it is going to get septic or not. So he is doubtful. :)