Must be from the English Dept.
Let's take a closer look at that. According to Merriam Websters online:
cru·el Listen to the pronunciation of cruel
cru·el·er or cru·el·ler; cru·el·est or cru·el·lest
Middle English, from Anglo-French, from Latin crudelis, from crudus
1: disposed to inflict pain or suffering : devoid of humane feelings <a cruel tyrant>2 a: causing or conducive to injury, grief, or pain <a cruel joke> b: unrelieved by leniency <cruel punishment>
synonyms see fierce
— cru·el·ly Listen to the pronunciation of cruelly \ˈkrü-(ə-)lē\ adverb
— cru·el·ness noun
So we can now see the Etymology of the term is from the 14th century Middle English with Latin roots. So, it may not necessarily mean that it is from the English Department which is presupposed in the originating statement. However, if one accounts for the colloquialism of the term then it could be perfectly acceptable to state that it is from the English Department. If one were to attach a sway bar to the term cruel then it would significantly decrease the tongue weight
and allow one more headroom for additional jargon.............