What's the difference between mirky and smirky?

Mirky

---

Definition:

• (a.) Dark; gloomy. See Murky.

Example Sentences:

Smirky

---

Definition:

• (a.) Smirk; smirking.

Example Sentences:

• (1) "Hathaway worked her derrière off," the Washington Post's Hank Stuever wrote , "[but] Franco came off like that lacrosse boy you wish your daughter didn't hang out with so much, sort of heavy-lidded and smirky."