The addition of -ity to an adjective results in a shift of stress to the antepenultimate syllable; that is, words in -ity are stressed on the last syllable before the -ity, even in cases where this syllable is part of another suffix (as in words in -ability and -icity).
adjective, dumber, dumbest. 1. lacking intelligence or good judgment; stupid; dull-witted. 2. lacking the power of speech (offensive when applied to humans): a dumb animal.
The pendulum has swung too far in the other direction from physician paternalism towards willful ignorance by patients. Why Smart People Are Dumb Patients Jean Kim July 13, 2014. If all of this seems complicated and difficult to follow, as a physician trying to keep up it most certainly is.