Difference between Low-keyed and Restrained

Low-keyed

Part of speech: adjective

Definition: Relaxed, unstressful, not pressured.

Restrained

Part of speech: adjective

Definition: Held back, limited, kept in check or under control.

Part of speech: verb

Definition: To control or keep in check.

Example sentence: Al Qaeda is nothing more than a mutant supply chain. They're playing off the same platform as Wal-Mart and Dell. They're just not restrained by it. What is al Qaeda? It's an open source religious political movement that works off the global supply chain. That's what we're up against in Iraq. We're up against a suicide supply chain.