Longest verbs

Here are some of the longest verbs in the English language, listed in alphabetical order.

anthropomorphize – 16 letters
conventionalized – 16 letters
counterbalanced – 15 letters
counterbalancing – 16 letters
counterchallenge – 16 letters
counterpointing – 15 letters
dedifferentiated – 16 letters
demythologizing – 15 letters
desynchronizing – 15 letters
differentiating – 15 letters
disenfranchised – 15 letters
hypophysectomised – 17 letters
individualizing – 15 letters
institutionalized – 17 letters
internationalized – 17 letters
interpenetrates – 15 letters
misrepresenting – 15 letters
misunderstanding – 16 letters
radiosterilized – 15 letters
traditionalized – 15 letters

There may be other, even longer verbs. If you know of some, hope you might add them in the comments.