cretinize

[kreet-n-ahyz or, esp. British, kret-]

verb (used with or without object), cre·tin·ized, cre·tin·iz·ing.

to make or become cretinous; cause (a person) to be incapable of normal intelligence or sound judgment.

Also especially British, cre·tin·ise.

Origin of cretinize

First recorded in 1855–60; cretin + -ize