petrifying
verb
Definitions
To harden organic matter by permeating with water and depositing dissolved minerals.
To produce rigidity akin to stone.
To immobilize with fright.
To become stone, or of a stony hardness, as organic matter by calcareous deposits.
adjective
Definitions
Causing immense fear; extremely scary
Example: The idea of speaking in front of such a large audience was petrifying.
Synonyms:frighteningterrifying