first–class

first–class /ˈfɚstˈklæs/ Brit /ˈfəːstˈklɑːs/ adjective
first–class
/ˈfɚstˈklæs/ Brit /ˈfəːstˈklɑːs/
adjective
Britannica Dictionary definition of FIRST–CLASS
1 
: of or relating to first class
2 
: of the best quality : of the highest excellence

— first–class

adverb