Quisuous (adj) (Scottish) (rare)
Difficult to deal with or settle; perplexing; (of a person) of dubious character.
Late 17th century. Origin uncertain; perhaps from classical Latin quisquis whoever, with subsequent alteration of the ending after adjectives in -ous. With the form quisquose perhaps compare -ose.
“I’ve tried to explain to him but you know how quisquous he can be!”
Nothingburger (noun) (Chiefly US)
A person or thing of no importance, value, or substance. Now esp.: something which, contrary to expectations, turns out to be insignificant or unremarkable.
1950s: from nothing and burger. Added to the OED October 2018.