I am writing a poem for school. The verse with the word I need to change is this:

7 hours is too long
In much too short a day
You really don’t care if you get an answer wrong
Because you don’t care a _____ about radioactive decay

The only thing I can think of is the word shit. Do any of you have an idea for a more clean alternative?

I have tried shiznit and shoot (which websites such as https://reallifeglobal.com/inoffensive-alternatives-to-bad-words-in-english/ and https://www.wordhippo.com/what-is/another-word-for/shit.html suggested as alternatives), but they don't sound great. Especially in a poem. I also searched up "don't care a ___" (https://idioms.thefreedictionary.com I searched up don't care a... and fig came up, then they also have a ton of things that mean a similar thing, tried them all, most worked literally, but I am looking for a more clever and poetic word or words that could be used)and still found nothing helpful. Before you answer, may I remind you that I am not looking for an answer like that, but an answer that relates in a way to my poem (maybe radioactive decay or something) would be ideal.

I do not want you to simply search up "don't care a...". I want suggestions that show thought and fit creatively into my poem. Do not just google it, and paste whatever answer you find here because I have tried most of those.

As for being put on hold, I do not believe my question is "off-topic". After all, my question relates to English. It is clearly not Physical Education! It is about word choice and usage (as I am questioning my word choice of the word shit, and am trying to find a better one that can be used in a more clear way), which is fine to ask about, according to the help center. So could you let me know why my answer was put on hold? Also, I have changed the part about it being to easy to answer. I put this into my question because I could not find an area where it would get the attention of the people who put my question on hold. Once it gets off being on hold, I will delete this.