ambivalence
analysis
apprehension
assessment
brooding
confusion
conjecture
consideration
contemplation
decisionmaking
deduction
deliberation
doubt
evaluation
examination
hesitation
incertitude
indecision
inference
insecurity
introspection
meditation
mistrust
perplexity
planning
ponderance
pondering
qualm
questioning
reasoning
reflection
rethinking
review
scrutiny
self doubt
selfexamination
skepticism
speculation
suspicion
tentativeness
thoughtfulness
uncertainty
unease
vacillation
wavering