petrify
1. [ verb ] cause to become stone-like or stiff or dazed and stunned
Examples:

"The horror petrified his feelings" "Fear petrified her thinking"

Related terms: deaden
2. [ verb ] make rigid and set into a conventional pattern
Synonyms: ossify rigidify
Examples:

"rigidify the training schedule" "ossified teaching methods" "slogans petrify our thinking"

Related terms: stiffen ossification inflexibility
3. [ verb ] change into stone
Synonyms: lapidify
Examples:

"the wood petrified with time"

Related terms: fossilize petrifaction
Similar spelling:   petrifying
  petrified
  Petroff