skepticism (n.)
- agnosticism
- apprehension
- caution
- cautiousness
- concern
- diffidence
- distrust
- distrustfulness
- doubt
- doubtfulness
- dubiety
- dubiousness
- incertitude
- incredulity
- misgiving
- mistrust
- qualm
- question
- scoffing
- scruple
- scrupulousness
- self-doubt
- suspicion
- suspiciousness
- uncertainty
- wariness
- wonder