Skepticism most nearly means?

Skepticism refers to a questioning attitude or doubting the validity of a particular claim or belief. It involves a level of doubt about the truth or accuracy of something, which aligns closely with the meaning of "doubtfulness." While cynicism might imply a more negative or critical view toward people's motives or the veracity of claims, skepticism encompasses a broader approach of inquiry and doubt without necessarily assuming a malevolent intent.

Skepticism is not equivalent to blind suspicion or disbelief; rather, it encourages critical thinking and the examination of evidence before accepting claims as true. This nuanced understanding is why "doubtfulness" is a more fitting term, as it captures the essence of questioning and uncertainty inherent in skepticism, compared to the other choices that either suggest a complete rejection (as in belief) or carry specific, often negative connotations.