The spelling of the word "diseasednesses" can be a bit tricky at first glance. It is pronounced as /dɪˈziːzd.nəs.ɪz/ and is derived from the root word "disease" with the suffix "-ed" to show past tense, the suffix "-ness" to indicate a state or quality, and finally the suffix "-es" to make it plural. This results in a word that denotes multiple instances of a state of being affected by a disease. Though complex, mastering the spelling of such words can assist in clearer communication and better writing skills.