Skepticism
From Google:
skep·ti·cism
ˈskeptəˌsizəm/
noun
skep·ti·cism
ˈskeptəˌsizəm/
noun
- 1.
a skeptical attitude; doubt as to the truth of something.
"these claims were treated with skepticism"
synonyms:doubt, doubtfulness, a pinch of salt - 2.
PHILOSOPHY
the theory that certain knowledge is impossible.