Sentence:  Last year, President Obama had large majorities in Congress and hopes of passing a comprehensive climate and energy bill. Next year, he faces a new Congress much more <WSD>dubious</WSD> about the reality of climate change and considerably more hostile to international efforts to deal with it. 
Meaning of the word marked with <WSD> tags:  In disbelief; wavering, uncertain, or hesitating in opinion; inclined to doubt; undecided.