Senioritis

I've been diagnosed with stage 4 senioritis.

I don't know, but "senioritis" is real, as I discovered in my senior year. Senioritis is a frame of mind particular to high-school seniors.

And right now she has a raging case of senioritis. […] Whether you call it senioritis or senior slump, there's no disguising the collective sigh of relief […]

I worked hard my senior year, something that was particularly difficult due to the senioritis that many others were feeling. But it paid off!