Perilous

adjective/ˈpɛɹ.ɪ.ləs/emotion

Definition

Full of danger or risk.

Etymology

From Middle English perilous, from Old French perilleus, equivalent to peril +‎ -ous, from the noun peril, or from Latin perīculōsus. Doublet of periculous.

Synonyms

treacherous

In a sentence

Migrating the database without a rollback plan was perilous.