Skeptical vs. Cynical
These two words are quite often used to mean the same thing, but there is a real difference.
‘Skeptical’ – to be doubting, investigating, and inquiring of the truthfulness of validity of something others say is true. The word came from Pyrrho and his followers in ancient Greece, who thought that real knowledge of this is impossible.
‘Cynical’ – to be bitterly distrustful or pessimistic of the motives of others, sneering and sarcastic. Likely from Kynosarge “The Gray Dog”, the gymnasium outside ancient Athens (for the use of those who were not pure Athenians), and their attitude to the ‘pureness’ of Athens.
Bonus points for understanding ‘Blind Faith’, which doesn’t question at all, simply accepts.