Question

very powerful and effective (e.g.of a drug or a symbol)

Accepted Answer

a POTENT new weapons system. / The opening of a Euro-Disneyland in the very heart of France is a POTENT symbol.

Front	very powerful and effective (e.g.of a drug or a symbol)
Back	a POTENT new weapons system. / The opening of a Euro-Disneyland in the very heart of France is a POTENT symbol.

Potent Powerful Effective E.G.Of Drug Symbol Weapons System