terrifying

verb (used with object), ter·ri·fied, ter·ri·fy·ing.

1. to fill with terror or alarm; make greatly afraid.

adjective

1. causing great fear or dread; extremely frightening

verb -fies, -fying or -fied

1. (tr) to inspire fear or dread in; frighten greatly

v.1570s, from Latin terrificare “to frighten,” from terrificus “causing terror” (see terrific). Related: Terrified; terrifying.