Diametrically opposed and Hard core

Hard core and diametrically opposed are semantically related. In some cases you can use "Hard core" instead an adjective phrase "Diametrically opposed".

Hard core noun - The most dedicated and intensely loyal nucleus of a group or movement.

Diametrically opposed and hard core are semantically related. Sometimes you can use "Diametrically opposed" instead an adjective phrase "Hard core".