sicko

A person with unpleasant tastes, views or habits.

1986 June 9, David Denby, Movies: Poison, New York, page 130, But in fact, the murders have been committed by an army of sickos, a phalanx of wild-eyed droolers led by a monster goon with a concrete jaw and a Neanderthal brow.

1997, Shannon Bell, Chapter 5: On ne peut pas voir l′image [The image cannot be seen], Brenda Cossman, Shannon Bell, Lise Gotell, Becki L. Ross, Bad Attitude/s on Trial: Pornography, Feminism, and the Butler Decision, page 231, We can′t say that it is our responses of horror and revulsion that are upsetting to the youth; therefore, those attracted to them are deviants, sickos, who should be cured/punished like the homosexuals of the forties and fifties.

A mentally ill person.

So come on, doc, precisely which kind of sicko is America? You might plump for depressed (isolationist), psychopathic (lack of empathy) or even psychotic (barking mad - what P.G. Wodehouse referred to as "thinking you're a poached egg").

You're a gambler, huh? A sicko like Essay?

A physically ill person.

The amazing Mr. Sick Day [Milo Filbum] has missed an amazing 73% of 1,020 work days for such ailments as a toothache, [...] "I finally gave the sicko his walking papers when other people started doing the same thing — calling in sick and all," the manager [said] ...

Sicko status: Can you keep going even when you're feeling out of sorts?

Characterized by depraved tastes or habits; deviant.

“Your kid isn't nuts.” “Ever had one of his broccoli-and-asparagus omelets? Kid eats another vegetable, I'm going to ram a carrot down his throat until he gags.” “Most parents would kill for a kid like yours. Come on, admit it. This kid was sicko.”

The damage level was sicko, even Eddy had been taken aback when they'd first gone inside, scared but trying to hide it. What was Eddy doing? "One last thing I wanna get," he'd said, and then disappeared back into the house. Now he was ...