skeptical

形容词 skeptical:

1. denying or questioning the tenets of especially a religion
   同义词：disbelieving, sceptical, unbelieving
2. marked by or given to doubt
   同义词：doubting, questioning, sceptical

1. The leader had the gift of being able to infuse enthusiasm into the most skeptical member of the group.
   那位领导人很有天赋，能使团体中最持怀疑态度的人都充满热情。