Nugatory and Pyrrhic

Nugatory adjective - Having no legal or binding force.

Pyrrhic and nugatory are semantically related. In some cases you can use "Pyrrhic" instead an adjective "Nugatory".

Pyrrhic adjective - Of or relating to or resembling Pyrrhus or his exploits (especially his sustaining staggering losses in order to defeat the Romans).

Nugatory and pyrrhic are semantically related. Sometimes you can use "Nugatory" instead an adjective "Pyrrhic".