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When looking for a word for a lengthy, tedious, boring, text*, I had the feeling that tirade could be the right one.

However I looked it up in on-line dictionaries and all of the the ones I consulted say that it's supposed to refer to an angry speech/text.

I'm not yet convinced though, I think I heard it used for what I'm looking for, in a humorous manner (and maybe the dictionaries I looked up only reported the canonical meaning).

So, can you native speakers confirm, or confute, my impression?

* I have already, unsatisfactorily, read idiom-to-describe-a-text-or-speech-which-is-too-long .

Tirade strongly suggests a long loud speach full of angry or unbalanced criticisms and complaints.

In contrast a harangue suggests a long tedious and pushy persuasive speach, but not necessarily an openly angry speaker.

If you are talking about a written document, a somewhat obscure term is screed:

screed (n): a long piece of writing, especially one that is boring or expresses an unreasonably strong opinion:

If not actually angry, a "tirade" should be at least loud and energetic and usually refers to oratory. If the speech was long but dull I would instead use something like monologue, or say the speaker droned on for some length of time.

A "tirade" can be boring (or at least tedious and repetitive), but since that's not included in the definition, you'd have to explicitly add that information.

A "harangue" is similarly energetic, and usually is meant to make the listener feel guilty for some misdeed. As with "tirade", if it's boring, you'd have to say so.

A lengthy, tedious, and boring text lacks the energy to catalyse any excitement and I would always associate a tirade with a long angry provocative speech whether oral or written. The closest synonym would be a rant which seems to me interchangeable as a less "fancy" word choice.

The word tome (for a text only) is more appropriate for the length and tedium but isn't nearly cruel enough if you are using the word as a weapon. If you are doing a review of the tome I would recommend launching into a tirade given what you have just been subjected to for hours on end :-)

If you want a word that is non-angry, long, and boring, then tirade is not it. The dictionaries aren't wrong. A tirade is given in anger.

Perhaps you're thinking of the third sense of Merriam-Webster's definition of monologue:

3 : a long speech monopolizing conversation

// I stifled a yawn as she continued her monologue about her vacation experiences.

This has the advantage of being applicable to both speech and text.

Or, there's the verb drone:

b : to talk in a persistently dull or monotonous tone

// droning on and on about his health

However, this one is applicable only to speech.