- 怀疑论 huáiyílùn skepticismskepticism; a philosophical doctrine that questions the possibility of certain knowledge
- 怀疑者 huáiyízhě skepticskeptic; someone who doubts or questions things
- 怀疑派 huáiyípài skeptica person or group inclined to doubt or disbelieve; the skeptics
- 心存怀疑 xīncúnhuáiyí to be suspiciousto be suspicious; to harbor doubts in one's mind
- 毫不怀疑 háobùhuáiyí without the slightest doubtto have no doubt at all; completely certain
- 怀疑主义 huáiyízhǔyì skepticismskepticism; the philosophical doctrine that absolute knowledge is impossible
- 怀疑心 huáiyíxīn incredulitya state of skepticism; a suspicious or doubting mind
