sceptical adj.

VERBS be, look, remain | become

ADV. deeply, extremely, highly, very | increasingly | fairly, mildly, rather, slightly, somewhat in a mildly sceptical tone of voice | openly They remained openly sceptical about her promises of improvement.

PREP. about He is deeply sceptical about the value of teaching poetry. | as to Many were sceptical as to whether the plan would succeed. | of They are highly sceptical of political leaders.