daunting
adjective uk/ˈdɔːn.tɪŋ/ us/ˈdɑːn.t̬ɪŋ/
令人发怵的；使人气馁的
making you feel slightly frightened or worried about your ability to achieve something
The country was faced with the daunting prospect of overcoming four decades of division. 国家仍然面临着弥合40年的分裂这一难题。
Synonym: intimidating