skeptical

definition: 
to question the truthfulness of information presented as facts; to not trust
sentence: 
I have always been deeply ambivalent — if not outright skeptical — about this hardware feature on an cell phone.
Some studies suggest that a skeptical brain works differently than a believing brain.
difficulty: 
easy
toefl frequency: 
2
toefl classification: 
adverb: 
skeptically
adjective: 
skeptical
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noun: 
skeptic
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