Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun skepticism

2 senses of skepticism

Sense 1
incredulity, disbelief, skepticism, mental rejection -- (doubt about the truth of something)
       => doubt, uncertainty, incertitude, dubiety, doubtfulness, dubiousness -- (the state of being unsure of something)

Sense 2
agnosticism, skepticism, scepticism -- (the disbelief in any claims of ultimate knowledge)
       => unbelief, disbelief -- (a rejection of belief)