fast ‧ ness /ˈfɑːstnəs, ˈfɑːstnɪs $ ˈfæst-/ BrE AmE noun [countable] literary
a place that is safe because it is difficult to reach SYN stronghold :
mountain fastnesses
fast ‧ ness /ˈfɑːstnəs, ˈfɑːstnɪs $ ˈfæst-/ BrE AmE noun [countable] literary
a place that is safe because it is difficult to reach SYN stronghold :
mountain fastnesses
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012