parlous

Perilous; dangerous.

Dangerously cunning.

Perilous; dangerous; alarming; mischievous.

Notable; knowing; shrewd.

Attended with peril; dangerous.

Venturesome; bold; mischievous; keen.

Attended with peril; dangerous; risky.

Dire, terrible, appalling.

Dangerously clever or cunning.

Very, extremely.