Hard core and Soft on

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

Soft on and hard core are semantically related. In some cases you can use "Soft on" instead an adjective phrase "Hard core".

Soft on adjective - Marked by foolish or unreasoning fondness.

Hard core and soft on are semantically related. Sometimes you can use "Hard core" instead an adjective phrase "Soft on".