Open English Wordnet
Verbs
(v)petrifycause to become stonelike or stiff or dazed and stunned from fright“The horror petrified his feelings”,
“Fear petrified her thinking” (v)rigidify, ossify, petrifymake rigid and set into a conventional pattern“rigidify the training schedule”,
“ossified teaching methods”,
“slogans petrify our thinking”