Which word describes a long harsh or abusive speech?

The word that describes a long harsh or abusive speech is "tirade." This term refers specifically to a prolonged outburst of angry speech, often filled with criticism or condemnation. It evokes the idea of someone expressing strong emotions, typically in a way that can be perceived as aggressive or forceful.

In contrast, "trite" refers to something that is overused and lack originality, making it inappropriate in this context. "Torpid" describes a state of inactivity or lethargy, which does not relate to the concept of a speech. "Truncate" means to shorten something by cutting off a part, which does not connect with the notion of a long speech. Therefore, "tirade" is the precise term for a lengthy and vehement verbal attack, fitting the description given in the question.