objection

Synonyms: cavil censure challenge counter-argument criticism declination demur demurral demurring difficulty disapprobation disapproval discontent disesteem disinclination dislike displeasure dissatisfaction doubt exception grievance gripe hesitation kick niggle odium opposition protest protestation question rejection reluctance remonstrance remonstration repugnancy revilement scruple shrinking squawk stink unwillingness

Antonyms: acceptance agreement concurrence consent