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Sceptical

/ˈskɛptɪkl/

not easily convinced; having doubts or reservations: "the public were deeply sceptical about some of the proposals" 

Dismissive
/dɪsˈmɪsɪv/ feeling or showing that something is unworthy of consideration:...

Critical
/ˈkrɪtɪkl/  expressing adverse or disapproving comments or judgements. "I...

Critical
/ˈkrɪtɪkl/  expressing adverse or disapproving comments or judgements. "I...