A person of a doubting state of mind.

怀疑者。

One who questions the truth or validity of generally accepted conclusions, natural phenomena.

怀疑论者。

Adherent of one of the ancient Greek philosophical schools that doubted the possibility of real knowledge of anything.

古希腊怀疑派学者的奉行者。

Same as sceptic.

亦可作 sceptic。