uphill Syllabification: (up·hill)Translate uphill | into French | into German | into Italian | into Spanish Definition of uphill adverb Pronunciation: /ˌəpˈhil/ in an ascending direction up a hill or slope:follow the track uphill adjective Pronunciation: /ˈəpˌhil/ sloping upward; ascending:the journey is slightly uphill requiring great effort; difficult:an uphill struggle to gain worldwide recognition noun Pronunciation: /ˈəpˌhil/ an upward slope. uphill in other Oxford dictionaries Definition of uphill in the British & World English dictionary