first–degree

first–degree /ˈfɚstdɪˈgriː/ adjective
first–degree
/ˈfɚstdɪˈgriː/
adjective
Britannica Dictionary definition of FIRST–DEGREE
always used before a noun
1 
US : of the most serious type : deserving the harshest punishment
2 
: of the least harmful or mildest type — compare second-degree, third-degree