noun
hardness and softness; hard line and moderate line
Often used in political or strategic contexts to contrast uncompromising and flexible approaches. Also used literally for physical hardness and softness.
交渉では硬軟両方の戦略を使い分ける必要がある。
In negotiations, you need to use both hard-line and moderate strategies as appropriate.
この素材は硬軟のバランスが優れて
This material has an excellent balance of hardness and softness.