fraught with peril

Very unsafe or risky. A trip to that part of town at night would be fraught with peril—why risk it? The villagers warned that our journey through the Carpathian Mountains would be fraught with peril. As a mother, you always worry about your kids, even when they're not doing things inherently fraught with peril.

fraught with danger/peril

Very risky indeed. Fraught with means “full of ” and is rarely used today except in the sense of something undesirable. The expression, a cliché since the nineteenth century, first appeared in print in 1576 as “fraught with difficulties”; the precise cliché was first cited by the OED as appearing in 1864 in H. Ainsworth’s Tower of London: “This measure . . . is fraught with danger.”