The miserrimum looks funny

It's the superlative form of miser 'wretched, miserable, unhappy'. tsuwm's already done the heavy lifting.

According to none footnote (in Google Books), it's an allusion to Boethius: in omni adversitate fortunae, infelicissimum genus est infortunii fuisse felicem. ("In every reverse of fortune, the most unhappy condition of misfortune is to have known happiness", link)

Ceci n'est pas un seing.