GNAWING
Meaning of GNAWING in English
gnaw ‧ ing /ˈnɔːɪŋ $ ˈnɒː-/ BrE AmE adjective [only before noun]
worrying or painful, especially for a long time:
gnawing doubts
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012