mistreat

mis- +‎ treat

• Rhymes: -iːt

mistreat (third-person singular simple present mistreats, present participle mistreating, simple past and past participle mistreated)

1. (transitive) To treat someone, or something roughly or badly.

   Synonyms: ill-treat, ill-use, abuse

2. (transitive, medicine) To administer an incorrect treatment to a patient.
   • 1989 April 8, John Dooley, “Syphilis and AIDS: What's the Connection?”, in Gay Community News, page 8:

     The syphilis that Catapano and other AIDS-syphilis theorists are especially concerned about may develop when repeated treponeme infections are not treated, or, more commonly, are 'mistreated with penicillin.

• mistreatment

• maltreat

• martites, mitrates, teratism