fastness /ˈfæstnəs/ Brit /ˈfɑːstnəs/ noun plural fastnesses
/ˈfæstnəs/ Brit /ˈfɑːstnəs/
noun
plural fastnesses
Learner's definition of FASTNESS
[count] literary
: a place that is difficult to get to or that can be easily defended if it is attacked要塞;堡垒